Answer:
Mutualism
Explanation:
The ostrich and gazelle have a mutualistic relationship. They help each other in terms of predator detection. Ostriches are tall and this enables them to see predators from afar, and they also have good eyesight. However, their sense of hearing and smell are not too good. This is where the gazelles come in.
Gazelles are short and they do not have the same advatageous vantage point of the ostriches, but they have better senses in terms of hearing and smelling. When each of them observe that the other is wary, they know that there is a predator around.
The ostrich and zebra engage in a mutualistic relationship where both species benefit from each other's senses to detect danger, akin to other mutualistic relationships in nature, enhancing their survival.
Explanation:The symbiotic relationship between an ostrich and a zebra is an example of mutualism. This closeness between the two species offers significant mutual benefits for their survival. The ostrich, which has a poor sense of hearing and smell, relies on the zebra's sharp senses for detecting dangers through these modalities. Conversely, the zebra, with its noted poor eyesight, depends on the ostrich's keen vision to perceive threats. When either species senses danger, it warns the other, allowing both to flee and enhance their survival chances. Comparable to this mutualistic relationship are others in nature, such as the bond between herbivores and intestinal bacteria, the clownfish and sea anemones, and the plover bird and the African crocodile. The essence of these symbiotic relationships is the shared advantages they provide to the participating species.
Hairs that clean dirt out of the air in your nasal passages are called:
A. sinus
B. trachea
C. cilia
D. mucus
Answer:
Explanation:
c
How does a fertilized egg become an organism made of many cells
The process by which a fertilized egg develops into an organism composed of many cells is known as embryogenesis.
What is Embryogenesis?
Embryogenesis is the process by which a fertilized egg, or zygote, develops into a multicellular organism through a series of highly coordinated and sequential developmental events.
Steps involve in embryogenesis:
1. Fertilization: Embryogenesis begins with fertilization, which occurs when a sperm cell successfully penetrates and fuses with an egg cell. This results in the formation of a diploid zygote.
2. Cleavage: After fertilization, the zygote undergoes a rapid series of cell divisions called cleavage. The cells produced during cleavage are called blastomeres.
3. Blastocyst Formation: The morula continues to divide and transform into a blastocyst.
4. Implantation: In many organisms, including humans, the blastocyst undergoes implantation into the uterine lining. The trophoblast cells interact with the maternal tissues, leading to attachment and embedding of the blastocyst into the uterine wall.
5. Gastrulation: It involves the reorganization of cells within the blastocyst, leading to the formation of three primary germ layers: the ectoderm, mesoderm, and endoderm.
6. Organogenesis: Organogenesis is the process by which the three primary germ layers differentiate into specific cell types and further organize to form organs and organ systems.
Thus, the process is known as Embryogenesis.
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Eons are the broadest category of geologic time, and we live in the Phanerozoic eon. The Phanerozoic eon is further divided into eras. What divides the three eras of the Phanerozoic eon?
A. The appearance of carbon on Earth and the appearance of atmospheric oxygen separate the three eras from each other.
B. The development of insects and the development of flying insects separate the three eras from each other.
C. The first life on Earth and the first multicellular life on Earth separate the three eras from each other.
D. Mass extinction events separate the three eras from each other.
Answer:
D. Mass extinction events separate the three eras from each other
Explanation:
The Phanerozoic is an eon, thus it is representative of the largest unit of geological time. It is further divided into three eras. The three eras of the Phanerozoic are the Paleozoic, Mesozoic, and Cenozoic. These three eras have been divided on the basis of mass extinction events. The Paleozoic ends with the mass extinction at the end of the Permian period, which is also the largest mass extinction ever, and it also marks the beginning of the Mesozoic. The Mesozoic ends with the mass extinction at the end of the Cretaceous period, occurring because of a large meteorite or comet impact, marking the beginning of the Cenozoic era. The Cenozoic era is still going, and even though there have been extinction throughout it, none of them has been of a scale big enough to be considered as a mass extinction, so until something like that happens, this era will continue to exist.
Which of the following denotes the divisions of the geologic time scale in correct order of decreasing lengths of time beginning with the longest time interval and ending with the shortest?a. eon, era, epoch, period b. era, period, epoch, eonc. eon, epoch, period, era d. eon, era, period, epoch
Answer:
d. eon, era, period, epoch
Explanation:
The geological time scale has been made so that the scientists can have a practical system about the classification of geological time, thus everything that has happened throughout it. The geological time unites have been defined in accordance with important events that have happened, thus marking their end or beginning. These events can be mass extinctions, catastrophes, climate patterns, domination of certain species etc. The longest of these time units is the eon, lasting for more than half a billion years, and up to 2 billion years. The era comes as the second longest time unit, lasting for several hundred million years. The period lasts for several tens of million years, and the epoch is the smallest unit, lasting for few million years, or several hundred thousand years.
The divisions of the geologic time scale, from longest to shortest, are eon, era, period, and epoch.
Explanation:The correct order of the divisions of the geologic time scale, from longest to shortest, is eon, era, period, and epoch. Therefore, the correct option is a. eon, era, epoch, period. The geologic time scale is a system that organizes Earth's history into different time intervals based on major geological and biological events.
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DNA replication allows the basic units of heredity found on segments of DNA, called ___ , to be passed on from parent to offspring.
Answer:
Genes
Explanation:
Genes code for proteins that leads to certain traits to be expressed, leading to phenotype to be seen based on different genotypes expressed.
Answer:
The answer is genes on edg 2020
Explanation:
The process by which volcanoes vent water vapor, carbon dioxide, nitrogen, and other substances is called ____.
Question 17 options:
oxidation
glaciation
differentiation
outgassing
Answer:
The process by which volcanoes vent water vapor, carbon dioxide, nitrogen, and other substances is called outgassing.
The ultimate purpose of respiration:
A. inhale 02 and exhale CO2
B. place oxygen in the lungs
C. place oxygen in the blood
D. deliver oxygen to every blood cell
Answer:
D. deliver oxygen to every blood cell
Explanation:
Respiration is the process by which organisms liberate energy from food by chemical processes. It is more appropriately called cellular respiration as the process occurs in the cell.
During respiration, energy is released from food when oxygen combines with food materials. The waste product is carbondioxide in most cases.
The ultimate purpose of respiration(breathing) is to furnish the body system with oxygen at cellular level for the release of energy.
Which best describes how the common cold spreads in the human body? A Bacteria burst out of normal cells killing them B viruses replicate inside respiratory cells C bacteria inject dna into normal cells D viruses insert dna into bacteria
Final answer:
The common cold spreads in the human body as viruses, particularly rhinoviruses, replicate inside respiratory cells, potentially causing cell damage or death, and triggering an immune response leading to symptoms.
Explanation:
The common cold is primarily caused by rhinoviruses, which are a type of virus, not bacteria. These viruses replicate inside the respiratory cells of the human body. The process involves the virus attaching to the cell, penetrating it, and then using the cell's machinery to replicate its own genetic material and produce new virus particles. As a result, the host cell may experience significant biochemical and structural changes, which can lead to cell damage or death through lysis or apoptosis. Once the new viruses are produced, they are released from the cell and can go on to infect adjacent cells, continuing the cycle of replication. The symptoms observed during a cold are a combination of the immune response trying to eliminate the virus and the damage caused by the virus itself.
Kerry is conditioned to fear strawberries. Raspberries are similar to strawberries, and even though no attempt was made to make Kerry fear raspberries, she reacts with fear when she sees them. This is an example of ________.A) imitation B) modeling C) stimulus discrimination D) stimulus generalization
Answer:
The correct option is D, STIMULUS GENERALIZATION.
Explanation:
Stimulus generalization refers to the conditioning process in which a conditioned stimulus evokes a similar response after it has been conditioned. A stimulus generalization is said to occur when a living organism responds to a stimulus in the same manner it responds to a similar stimulus. This typically occur as a result of classical conditioning.
Since Kerry is responding to raspberries the same way it responds to strawberries, which it has been condition to fear, we can conclude that Kerry is experiencing stimulus generalization.
This is an example of Stimulus generalization. So, the correct option is D.
What is Stimulus generalization?Stimulus generalization is the tendency of a new stimulus to evoke responses or behaviors similar to those elicited by another stimulus.
Stimulus generalization occurs when a stimulus that is similar to an already conditioned stimulus begins to produce the same response as the original stimulus does.
Here, Kerry feared with strawberry, but not with raspberry. Therefore, a conditioned stimulus is provided in order to evoke the original stimulus.
Thus, this is an example of Stimulus generalization.
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Utilizing ultisols for agriculture requires _______. a. extensive irrigation b. fertilizer to balance the high alkalinity of the soil c. adding organic matter to supplement the shallow horizons d. fertilizer to replace nutrients that leach from the soil
Answer:
fertilizer to replace nutrients that leach from the soil
Choice D is correct
Explanation:
Utilizing ultisols for agriculture requires fertilizer to replace nutrients that leach from the soil
1.True or false? Gametogenesis is the same as meiosis?
2. Name two types of gametogenesis and how they are different from each other.
3 Why is it important that only one viable egg cell is produced during meiosis in females?
1. False. They are similar, though.
meiosis- A kind of cell division involving having the chromosome number. It is responsible for genetic recombination.
Gametogenesis- It's the process when gametes or germ cells are produced in an organism. They undergo meiosis to form gametes.
2. Spermatogenesis- happens in the testes of males. 4 gametes are produced. Spermatogenesis involves a metamorphosis stage called spermiogenesis. Spermatogenesis produces small, motile spermatozoa
Oogenesis- takes place in the ovary in a female. 1 gamete produced. in oogenesis there is no metamorphosis stage. In oogenesis the ovum is spherical, and isn't motile and is bigger with more food reserves and cytoplasm.
3. Because The one egg cell that results from meiosis contains most of the cytoplasm, nutrients, and organelles.
1. No, Gametogenesis is not same as meiosis.
What is gametogenesis?The creation of gametes from haploid progenitor cells is known as gametogenesis.
What is meiosis?Meiosis is a kind of cell division that results in a reduction in the number of chromosomes in gametes (the sex cells, or egg and sperm).
2. Gametogenesis are classified into two types. They are
Spermatogenesisoogenesis.What is Spermatogenesis?Spermatogenesis is the scientific name for the production of sperm cells.
To create spermatozoa, rounded immature sperm cells go through many mitotic and meiotic divisions (spermatocytogenesis), a metamorphic change (spermiogenesis), and a metastatic transformation.
What is oogenesis?The process of developing mature female gametes from primordial germ cells is known as oogenesis.
3. Meiosis produces one egg, which has the greatest nutrition, cytoplasm, and organelles. One huge cell and one cell with more DNA result from the uneven distribution of chemicals (polar body which gradually degenerates).
What is cytoplasm?The gelatinous liquid that makes up a cell's interior is called cytoplasm.
What is organelles?Inside cells, organelles are specialized structures that carry out a variety of tasks.
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1. Mendel observed that pea plants had traits, such as color, that were either “one or the other,” never something in between. Discuss the correlation between Mendel’s factors, what they might be, and why pea plant traits come in one form or another—e.g., gray or dark red—rather than blended.
Answer: because a trait is either dominat or recessive and they can't both show at the same time. Even if both are present only 1 will show: homozygous dominate(AA), heterzygous(Aa), or homozygous recessive(aa).
Answer:
The trait may be dominant or recessive.
Explanation:
Mendel worked on the pea plant (Pisum sativum) . Mendel is known as the "Father of Genetics".
Monohybrid cross of pea plant demonstrated the law of dominance. According to this law, in a pair of contrasting trait one trait which can express itself among the trait and hides the expression of other trait. This trait which can express itself is known as dominant trait. The trait which cannot express itself is recessive trait. Recessive trait will express itself only in the homozygous condition. Gray or dark red color depends on the whether the trait is dominant or recessive. Blended expression of trait do not occur if the trait follows the Mendel law.
If one strand of dna contains the bases acagt, what would be the complementary bases on the mrna strand?
Scientific evidence is most likely to be consistent if it is based on data from
Scientific evidence is most likely to be consistent if it is based on reliable and accurate data obtained through controlled experiments or observations.
Explanation:
Scientific evidence is most likely to be consistent if it is based on reliable and accurate data obtained through controlled experiments or observations. These experiments or observations should be conducted using proper scientific methods and adhere to accepted standards of research.
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The use and application of living things and biological processes is known as
a. human biology.
b. medical research.
c. biotechnology.
d. epidemiology.
Answer:
THE ANSWER IS C. BIOTECHNOLOGY
Explanation:
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Which area pictured below represents the largest reservoir of water on Earth?
A. Area 1 ( I think that its this answer, but I want to make sure its correct)
B. Area 2
C Area 3
D. Area 4
Answer:
C Area 3
Explanation:
The largest reservoir of water on our planet is the ocean and not the clouds.
Water is the most abundant substance on our planet and it is estimated that the vast majority of all water on earth is stored in the ocean, it is no wonder that planet Earth has 70% of its surface covered with water and the most of that water makes up the oceans.
The second largest reservoir of water is glaciers, followed by groundwater and clouds.
Although there is no provided diagram, usually the largest reservoir of water on Earth is the world's oceans, which hold more than 96% of all Earth's water. The correct answer would be the area representing the world's oceans on your diagram.
Explanation:Based on the nature of the question, it appears to be referring to the distribution of water on Earth. Without the specific visuals, it's challenging to provide a definite area; however, it's crucial to know that the largest reservoir of water on Earth is the world's oceans. The oceans account for over 96% of all Earth's water. Whether labeled as Area 1, 2, 3, or 4 in your diagram, the correct answer would be the area representing the oceans. Continue studying Earth's hydrosphere for a better understanding of water distribution on Earth.
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If you have a hamster with short fur, what possible genotypes could the hamster have?
Answer:
It would be Ff and FF
Explanation:
A student from one of the research labs is having trouble preparing a slide for examination and photographing. The bacterial slide that he has brought to you was prepared using a commercially purchased stain. He has asked for your help in determining what he is doing wrong so that he can change the lab protocols and continue on with his project. After examining the slide under oil immersion, you determine that no bacteria are present even though the student is able to show you the culture he used to make that slide that has visible growth in the liquid medium.Which of the following statements does NOT explain the fact that there are no bacteria present on the student's slide?
Rinsing with alcohol during the washing step stripped the bacteria off the glass slide.
By not allowing a glass slide to completely air dry before heat fixation, the flame will cause the surrounding water to boil and this will damage the bacterial cell.
Overheating during the fixation step boiled the water within the bacterial cells and resulted in the cells bursting.
Insufficient heating of the slide did not drive out the thin layer of water and this resulted in minimal bonding between the bacteria and the glass slide.
Answer:
The side bloops to the left
Explanation:
It's a right angle
we all have different forms of genes from our parent(s).what are these different forms called?
A.alleles
B.characters
C.DNA
D.resources
Answer:
the answer is allele
Allele. Genes come in more than one form. The different forms are called alleles.
How many molecules of ATP are produced from 1 molecule of glucose at the end of glycolysis? How many molecules were used to start the process? What is the net gain of ATP molecules from 1 molecule of glucose?
2. Which is not an example of condensation nuclei?
A smoke
B salt particles
C water droplets
Water droplets are not an example of condensation nuclei; they are the products created due to the presence of nuclei such as smoke or salt particles.
Explanation:In the process of condensation, the gas phase of a substance changes into its liquid phase. Condensation nuclei act as a 'meeting point' where water vapor in the air can accumulate and condense to form water droplets. These nuclei can be various particles, such as smoke, salt, dust, and more, suspended in the atmosphere. Hence, options A (smoke) and B (salt particles) in the question can act as condensation nuclei. On the other hand, option C (water droplets) is not an example of condensation nuclei; instead, they are the products formed due to the presence of these nuclei.
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Condensation nuclei are small particles in the atmosphere around which water vapor condenses to form cloud droplets. Both smoke and salt particles can act as condensation nuclei. However, water droplets are not condensation nuclei, but the result of the condensation process.
Explanation:In the context of atmospheric science, condensation nuclei are small particles in the atmosphere around which water vapor condenses to form cloud droplets. These nuclei can be composed of a variety of materials such as dust, smoke, and salt particles.
Option A (smoke) and B (salt particles) can be examples of condensation nuclei as both can serve as surfaces for water vapor to condense. However, option C (water droplets) are not an example of condensation nuclei. Instead, they are the result of the condensation process that occurs around the nuclei.
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Jeremy is conducting an experiment and has just made an educated guess as to what will happen in the experiment. Which step of the scientific method is this? A. Identifying variables B. Analyzing data C. Stating the problem D. Making a hypothesis
Answer: Option (D) is the correct answer.
Explanation:
A hypothesis is defined as an educated guess with the help of which an individual might predict what would happen in a certain experiment or situation.
When we evaluate some data with the help of analytical and reasoning approach then it is known as analyzing data.
Stating the problem means defining the problem so that others can also get to known the problem.
Therefore, we can conclude that when Jeremy is conducting an experiment and has just made an educated guess as to what will happen in the experiment then making a hypothesis is the step of the given scientific method.
What is the correct equation for cellular respiration?
a. 6CO2 + 6H2O + Energy ----------> 6O2 + C6H12O6
b. 6CO2 + 6H2O ----------> 6O2 + C6H12O6 + Energy
c. 6O2 + C6H12O6 --------> 6CO2 + 6H2O + Energy
d. 6O2 + C6H12O6 + Energy -------------> 6CO2 + 6H2O
The correct equation for Cellular respiration is:
6O2 + C6H12O6 --------> 6CO2 + 6H2O + Energy
Cellular respiration occurs in humans and animals. It is the process whereby, humans breathe in oxygen and breathe out carbon dioxide.During the process of cellular respiration, when oxygen is breathed in, it interacts, combines, and reacts with glucose and this results in the formation of carbon dioxide, water, and energy.
The equation for cellular respiration is given as :
6O2 + C6H12O6 --------> 6CO2 + 6H2O + Energy
Therefore, the correct option is option c.
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The correct equation for cellular respiration is 6O2 + C6H12O6 + Energy -------------> 6CO2 + 6H2O.
Explanation:The correct equation for cellular respiration is option d. 6O2 + C6H12O6 + Energy -------------> 6CO2 + 6H2O.
During cellular respiration, glucose (C6H12O6) is broken down in the presence of oxygen (O2) to produce carbon dioxide (CO2), water (H2O), and energy in the form of ATP.
This process occurs in the mitochondria of cells and is essential for the production of energy needed for various cellular activities.
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What percentage of someone’s genetic background may contribute to alcohol dependency?
Answer:
The percentage of an individual genetic background that may contribute to alcohol dependency is 50%.
Explanation:
Alcohol dependency refers to a chronic disease in which the affected individual has an uncontrollable urge for alcoholic drinks. There are many factors that can cause one to depend on alcohol and one's genetic background is one of them.
Recently, researchers have been able to identify a specific gene that is responsible for development of alcoholic dependency. Before now, scientific studies have been able to proof that children born by alcoholic parents have high tendency of becoming alcoholic adults. The percentage of genetic heritage that is responsible for alcoholic use is as high as 50%
Where does the esophagus lead to in a frog?
The tube that connects the mouth to the stomach.
The esophagus in a frog connects the pharynx to the stomach, enabling the passage of food. It plays a crucial role in directing ingested materials to the stomach for further digestion.
The esophagus in a frog, much like in humans, is a crucial part of the digestive system. Here is a detailed explanation:
Esophagus: The frog's esophagus is a tubular structure that connects the pharynx to the stomach.Pathway: Food, after being swallowed, travels from the mouth through the esophagus.Function: The primary function of the esophagus is to facilitate the passage of food to the stomach for digestion.Destination: The esophagus leads directly into the frog's stomach, where the digestion process continues.In summary, the esophagus is a muscular tube directing food from the pharynx to the stomach, ensuring the food correctly enters the digestive system.
What is the function of the gametophyte generation of the fern plant? Not multiple choice.
produces reproductive organs which produce a zygote
produces meiospores which grow into a sporophyte plant
produces a new fern asexually
grows as a diploid fern
The function of the gametophyte generation of the fern plant is it produces reproductive organs which produce a zygote.
What is the function of the gametophyte generation of the fern plant? Fern gametophyte is a gametophytic phase in Fern plants that are associated with gamete formation.Ferns exhibit alternations in generations of their life cycle and possess diploid sporophytic and haploid gametophytic stages.It produces reproductive organs which produce a zygote.Zygotes grow into the sporophyte(diploid), and spores grow into the gametophyte(haploid). The sporophyte produces haploid spores through meiosis, gametophyte produces gametes through mitosis.A major function of the gametophyte generation is to produce haploid gametes. The fusion of the egg cell with the sperm cell gives rise to the sporophyte, thereby completing the life cycle. In many lower plants, gametophytes are the dominant and free-living generation.So, the function of the gametophyte generation of the fern plant is it produces reproductive organs which produce a zygote.
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How do gases increase the overall greenhouse effect? A. Trapping energy from the sun in the earth's atmosphere B. Increasing the overall width of the ozone C. Increasing the size of the stratosphere and decreasing the size of the mesosphere
Answer:
A. Trapping energy from the sun in the earth's atmosphere
Explanation:
The gases, or rather the greenhouse gases, are gases that have the ability to trap the heat into the earth's atmosphere. When there's enough of these gases in the atmosphere, the heat that is reflected from the earth's surface and heads back toward the space is trapped in big portion by them. As the heat is trapped and accumulated, the atmosphere become warmer, thus the global climate changes gradually and it becomes warmer. The gases that have the biggest influence in this process are the carbon dioxide and the methane.
which of the following allele pairs demonstrate a heterozygous dominant trait?
A.aa
B.AA
C.Aa
D.AB
The allele pair that demonstrates a heterozygous dominant trait is C. Aa. Recessive traits are observed in individuals that are homozygous (aa) and the AB blood type in ABO blood groups is an example of multiple alleles and codominance.
The allele pair that demonstrates a heterozygous dominant trait is C. Aa. Heterozygous means having two different alleles for a single trait, where one allele is dominant and the other is recessive. The capital letter 'A' represents the dominant allele and the lowercase letter 'a' represents the recessive allele. Therefore, an organism with the Aa genotype expresses the dominant phenotype.
A recessive trait will be observed in individuals that are C. homozygous. This means they have two copies of the recessive allele (aa).
When considering ABO blood groups, if a heterozygous blood type A parent (IAi) and a heterozygous blood type B parent (IBi) mate, one quarter of their offspring are expected to have the AB blood type (IAIB) where both the A and B alleles are expressed equally. This is an example of d. multiple alleles and codominance.
Name the branch of medicine concerned with digestive diseases?
Answer: Gastroenterology
Explanation: Gastroenterology is a branch of medicine concerned with digestive diseases. The practice of gastroenterology concentrates on the diagnosis and treatment of diseases involving the esophagus, stomach, small intestine, and large intestine (colon), liver, and pancreas. Examples of conditions treated: Abdominal pain.
Gastroenterology is the branch of medicine specifically focused on diagnosing and treating disorders and diseases that affect the digestive system, including a broad range of conditions from ulcers and gastroparesis to more serious diseases like cancer.
Explanation:The branch of medicine that is concerned with digestive diseases is called Gastroenterology. This medical specialty deals with a wide range of conditions and diseases that affect the digestive organs and can occur with different frequencies as you age. Some of these pathologies include hiatal hernia, gastritis, peptic ulcer disease, duodenal ulcers, maldigestion, malabsorption, hemorrhoids, diverticular disease, constipation, jaundice, acute pancreatitis, cirrhosis, and gallstones. Each of these conditions directly influences the function of the digestive system and could critically affect a person's overall state of health.
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Two students completed an experiment to determine if pesticide use at local farms was causing fish kills in a local pond. The steps of the experiment are listed below. Select one location to collect water samples in the pond. Collect a 5-mL water sample at 8 am for two days. Measure the amount of pesticide present in each sample using the same measurement tools. After analyzing their data, the students conclude that pesticide runoff from farms is not causing the fish to die in the pond. Which of these statements best describes why their conclusion is not reliable?
1)The pesticide measurements were the dependent variable.
2)The samples were collected at different times.
3)The samples were only collected for two days.
4)The time of sample collection was not an independent variable.
In a scientific inquiry, we often seek to investigate the impact of one variable on another. These variables in the study are known as dependent and independent variables.
In experimental research, the independent variable also known as(cause) is unaffected by other factors in your research.
The dependent variable is affected depending on the changes occurred in the independent variable, as such they are dependant on the independent variable.
In experimental research, the person carrying out the experiment manipulates or changes the independent variable to see what influence it has on the dependent variable.
From the given question, the experimenter wants to test and deduce whether the pesticides kill the fish in the farm pond.
Dependent variable = pesticides
However, the reason why they failed to get a reliable result in their conclusion is that they attribute the dependent variable which is the fish kill to the pesticides.
So, the true variables should be:
The independent variable ⇒ is the pesticideThe Dependent variable ⇒ is the death of the fishTherefore, we can conclude that the best statement that describes why their conclusion is not reliable is in Option (1).
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The students' conclusion that pesticide runoff is not causing fish kills is not reliable because they only collected data for two days, which is insufficient to account for variable factors and lacks a control group.
Explanation:Two students concluded that pesticide runoff from local farms is not causing fish to die in the pond based on their experiment. However, given the information provided, the reliability of their conclusion is questionable. The statement that best describes why their conclusion is not reliable is 3) The samples were only collected for two days. This is a significant limitation because a longer period of observation would provide a more accurate picture of the regular levels of pesticides and their fluctuations. Variables like weather events, farming practices, and seasonal changes can all impact pesticide runoff, and two days of data are insufficient to account for these variables.
Additionally, to ensure the data's reliability, the experiment should have included a control group and possibly sampled multiple locations at different times to account for variation. Without these, it is difficult to ascertain whether the detected levels of pesticides are abnormal or if other factors could be responsible for the fish kills.