How are mitosis and meiosis similar?

The headings that best complete the chart are X: Commensalism and Y: Parasitism.

The headings that best complete the chart are:

In the first relationship, the boxing crabs and the anemones have a commensal relationship because the anemones benefit from the shelter and food dropped by the crab, while the crab is not affected. In the second relationship, the fleas are parasites because they benefit by feeding on the dog's blood, while the dog is harmed by the bites and itching caused by the fleas.

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Answer:

A.There would be less genetic variation in humans

Explanation:

During the process of crossing over chromosomes of a homologous pair exchange equal segments with each other. This results in new combinations of genes in the gametes that are not found in either parent, contributing to genetic diversity. Therefore, if this did not occur there would be less genetic variation in humans

There would be less genetic variation in human, if crossing over did not happen during meiosis in humans. thus option A is correct.

The crossing over is a process that is essential to human genetic diversity. During the crossing over parts of the homologous chromosomes ( two chromosomes identical by structure, but different in origin, one inherited from the mother and one from the father) randomly exchange parts of their sequences.

If the crossing-over didn't exist, this would greatly decrease the genetic diversity because the chromosomes would always be passed o the next generations unchanged.

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Answer: B is an unsaturated fatty acid

If 21 of 100 organisms have short legs (q2 = 0.21 >> q = 0.46), then the value of p is equal to 0.54.

Hardy-Weinberg equilibrium is a model used in population genetics to estimate genetic and allele frequencies.

In conclusion, if 21 of 100 organisms have short legs (q2 = 0.21 >> q = 0.46), then the value of p is equal to 0.54.

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Answer:

A. No nonvascular plants bear seeds, but not all vascular plants bear seeds

Explanation:

Nonvascular plants are those that do not have conductive vessels (xylem and phloem), in addition, nonvascular plants do not have seeds, fruits or flowers.

Some examples of nonvascular plants are mosses and liverworts.

Most vascular plants (have conductive vessels) have seeds, as in the case of angiosperms and gymnosperms, however, there are also some species of seedless vascular plants, represented by the lycopods and especially the pteridophytes, which are in greater number.

Examples of seedless vascular plants: ferns and horsetails.

The double-layered structure of phospholipids with proteins is known as the cell membrane. It separates the interior of the cell from the external environment and the embedded proteins perform important functions.

The structure you're referring to, a double layer of phospholipids with proteins, is known as the cell membrane (Option B). This boundary, also termed plasma membrane, separates the cell’s interior from its external environment. The phospholipids form a 'bi-layer' with their hydrophobic (water-repelling) tails pointing inwards and their hydrophilic (water-attracting) heads facing outwards.

The proteins embedded within this structure carry out a variety of essential functions such as transporting substances in and out of the cell.

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Answer:

Small pores called gastric pits

Explanation:

Small pores called gastric pits protect the lining of the stomach from acidic gastric juices.

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Answer:

What protects the stomach lining of gastric juices is the Gastric Mucosa.

Explanation:

The Gastric Mucosa is the lining of the stomach, which consists of an internal epithelium, a middle mocous membrane and an external muscularis mucosae. The superficial cells produce mucus that protects the stomach from the attack of acid and digestive enzymes. When the epithelium invaginates within the mucous membrane in various regions of the stomach, different tubular gastric glands are formed. These glands are made up of cells that secrete mucus, enzymes, hydrochloric acid and hormones.

The stomach mucous lining the inside of the stomach with the thickness and texture necessary for our digestive organ not suffer the effects of their own corrosive juices. This mucus lubricates the food bolus to circulate easily through the digestive tract and also forms a thick coating on the inner wall of the stomach to prevent, precisely, being digested by their own juices.

The acids attack, of course, this mucuous wall, but the stomach wall regenerates them continuously. In addition, the stomach lining makes its own antacid, secreting bicarbonate to neutralize the acid.

When a scientific theory is shown to be an accurate description of a phenomenon, It's tested by other scientists to replicate the experiment and confirm the findings.

A scientific theory refers to an explanation of an aspect of the natural world that may be tested over and over again as well as verified according to the scientific method, utilizing accepted protocols of observation, measurement, and evaluation of results. Theories tend to be tested under controlled conditions in an experiment.

Answer:

If the activity of osteclasts(which demineralize bone) exceeded osteoblast activity(production of new bone), then the bone's mineral content(and thus its mass) would decline, making it weaker.

If osteoblast activity exceeds osteoclast activity, there could be an increase in bone density but potentially abnormal bone structure due to imbalanced bone remodeling. Drugs may be used to help balance osteoblast and osteoclast activity to maintain healthy bones.

It's important to remember that the balance between osteoblasts and osteoclasts fixation and absorption activities play an integral role in our body's skeletal health.

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Answer:

They increase environmental quality by preventing resource overuse.

Explanation:

Marine protected areas are regions of the seas and oceans that are restricted from human activities.

The goal of marine protected areas is to conserve naturally available resources in the ocean. To conserve resources, materials are used resonably in order to prevent them from being limited in terms of availability.

When a marine area is protected, the enviromental quallity improves because biodiversity of life and resources can be perfectly in check.

Answer:

See explanation below.

Explanation:

The star that is nearest to our solar system is Proxima Centauri. It is about 4.22 light years away. That means if you travel at the speed of light, it will take you 4.22 years to travel from here to there.

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Answer:

Answer is B.

Explanation:

The fact that B is right eliminates A and D. C is eliminated because RBCs do not have nuclei.

Answer:

Variation.

Explanation:

Variation describes differences between organisms.

The word used to describe the differences of individual organisms is 'variation'. Variation in organisms can result from genetic differences or differential gene expression, making each individual unique. The complexity of these variations contributes to the challenges in defining biological species and classifying living organisms.

What Word Is Used to Describe Differences of Individual Organisms?

The word used to describe the differences of individual organisms is variation. These variations arise due to the unique DNA makeup of each organism, leading to a wide array of biological diversity. Every organism, including humans, exhibits variation in their genotype and phenotype, which are evident in the natural world's complexity. This is why, even among organisms classified within the same species, we observe notable diversity in physical traits, behaviors, and genetic makeup.

Understanding Variation in Biology

Variation is a fundamental concept in biology that explains the differences between individuals within the same species and between different species. These differences can be minor, like varying colorations among individuals, or significant enough to affect their physiological functions. Such variations are not only due to differences in the genetics of each organism, which could lead to conditions like sickle cell anemia, but also due to gene expression. For instance, despite having the same genetic information, two cells in an organism can function differently due to the specific genes that are active (expressed) within each cell.

Moreover, defining a species is a complex task because it involves a multitude of factors such as behavior, genetics, and morphology. While the Linnaean classification system placed organisms into hierarchical categories based on shared traits, the concept of a species has evolved to account for the underlying genetic and phenotypic variations that are emblematic of life's evolutionary history.

The common feature of all macromolecules is that they are formed from the same elements.

WHAT ARE MACROMOLECULES?

Hence, The common feature of all macromolecules is that they are formed from the same elements.

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Explanation: Sunspots are dark areas that appear on the surface of the Sun. caused by strong magnetic activity within the Sun.

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Sunspots are darker, cooler areas of the surface of the sun in a region called the photosphere. Which has temperature of 5,800 degrees. Caused by interaction with suns magnetic field which are not fully understood.

Burning wood to produce ashes is an example of a chemical change because it results in the formation of new substances with different properties than the original material.

The activity that is an example of a chemical change is burning wood to produce ashes. Unlike the other options, which involve changes in physical state or shape that are reversible and that do not involve the formation of new substances, burning wood results in a transformation that creates entirely different substances, such as carbon dioxide and water, from the original wood.

Chemical changes are characterized by a change in the chemical identity of the substances involved. New substances with different chemical properties from the original substances are formed. In the case of burning wood, the wood combusts with oxygen in a chemical reaction to form ash, carbon dioxide, and other compounds, which cannot be turned back into wood, illustrating a chemical change.

The difference between an acidic solution and a basic solution lies in their pH value and hydrogen ion concentration. Acidic solutions have a pH less than 7 and high hydrogen ion concentration, while basic solutions have a pH greater than 7 with lower hydrogen ion concentration.

The main difference between an acidic solution and a basic solution lies in the pH value and the concentration of hydrogen ions (H+ or H3O+). An acidic solution has a pH less than 7 and a higher concentration of hydrogen ions, which means [H3O+] > 10-7 M. Conversely, a basic solution, also known as alkaline, has a pH greater than 7; this indicates a lower concentration of hydrogen ions, or in other words, [H3O+] < 10-7 M. A neutral solution stands exactly at a pH of 7, meaning [H3O+] = 10-7 M, with equal concentrations of hydrogen and hydroxide ions.

Acids are substances that increase the concentration of hydrogen ions when dissolved in water, while bases decrease it. This ion concentration is a critical factor in determining a substance's acidity or basicity. Solutions with pH values lower than 7 are considered acidic, while those with pH values higher than 7 are seen as basic. For example, gases like CO2, NO2, and SO2 can dissolve in water to form weak acids, which is why rainwater is naturally slightly acidic.

Answer:

Atoms

Explanation:

Answer:

Atoms

Explanation:

They are the smallest unit of matter than we can identify.

Dog is not an autotroph​ .Dogs cannot produce their own food they are consumers and rely on eating other organisms to obtain energy.

The correct option is D .

Autotrophs are organisms that can produce their own food by converting inorganic substances into organic compounds through processes like photosynthesis or chemosynthesis. Dogs are not autotrophs; they are heterotrophs, which means they rely on consuming organic matter (such as food) to obtain the energy and nutrients they need to survive.

Autotrophs, on the other hand, can create their own food using energy from sunlight (in the case of plants and algae) or from chemical reactions (in the case of certain bacteria).

The complete question is :

which of the following is not an autotroph​ ?

A) Sunflower

B) Butterfly

C) Algae

D)Dog

Hence , D is the correct option

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Answer:

flaccid, hypertonic.

Explanation:

It became flaccid due to the low water potential in solution outside of potato cells, hence causing water to leave the potato cells & move into the solution.

Hypertonic solution simply means the concentration of solute is higher & water potential is lower than in potato cells.

Final answer:

A potato soaked in a strong salt solution will feel shrivelled due to water moving out of it, as it was in a hypertonic solution.

Explanation:

A potato soaked in a solution of 1 cup of salt to 1.5 cups of water for one hour will feel shrivelled because it was in a hypertonic solution. This occurs because the concentration of solutes is higher in the solution outside the potato compared to inside, creating a condition where water moves out of the potato into the surrounding solution to balance the concentration levels. This osmotic process leads to the potato losing water, hence the shrivelled texture.

There are two correct statements, they are:

1. The universe looks the same from all directions, but can change and evolve over time.

4. Scientists can study the universe because the cosmological principle suggests that any physical laws or processes are the same for the entire universe.

Final answer:

The cosmological principle asserts that the universe is homogenous and isotropic; the true statements regarding this principle are 1. The universe looks the same from all directions, but can change and evolve over time and 4. Scientists can study the universe because the cosmological principle suggests that any physical laws or processes are the same for the entire universe.

Explanation:

The cosmological principle is a fundamental assumption in our understanding of the universe. It states that on a large scale, the universe is homogeneous and isotropic, meaning it is the same in all directions and locations. Regarding the student's question, the first and fourth statements are true:

These statements align with current evidence, including the expansion of the universe as observed by Hubble and later research, which implies the universe's uniformity, apart from evolution over time. Models like the Big Bang theory are built on the cosmological principle. It has enabled us to understand not just our local part of the universe but to make scientific predictions about the universe as a whole, its structure, origin, and potential fate. It is important to note that scientific knowledge could change with new information, but basic scientific principles have withstood the test of time.

Answer:

Between 3 o'clock and 11 o’clock

Explanation:

Answer: THE CEREBELLUM IS RESPONIBLE FOR

COORDINATION!!!!

Explanation:

its responsible for all body coordination,:)

DNA stands for deoxyribonucleic acid. it's located in the cell nucleus. DNA is the molecule that has the genetic code of organisms.

Answer:

DNA is a self replicating material which is present in almost all living organisms as the main constituent of chromosomes. It is also the carrier of genetic information.

DNA is located in the cell nucleus where it is called nuclear DNA.

And small amount of DNA can also be found in the mitochondria where it is called mitochondrial DNA.

Answer:

is an experimental technique that uses genes to treat or prevent disease.

Explanation:

Answer:

Gene therapy is a form of Genetic Engineering

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Answer:

The answer is the good use of natural resources.

Explanation:

What makes a resource sustainable, is the sustainable use of these natural resources, which consists in using them in a rational way, conserving the environment in such a way that we can continue enjoying it and taking advantage of it in the future. Protection and harmony with the environment are factors that allow resources to be sustainable, which is important for development and for improving the quality of life of the population.

Proper use, conservation and recycling of resources will ensure that a resource is sustainable.

Resources are those materials found in the natural environment used by man to for his immediate use as well as for production of other goods.

Examples of resources are water, plants, minerals, etc.

Proper use and conservation of resources will ensure that a resource is sustainable as it those resources will last for a longer time.

Also, recycling and reusing of resources will make it sustainable.

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Answer:

proteins

Explanation:

Rough endoplasmic reticulum is the area in a cell where proteins are synthesized.

ANSWER:

The correct answer is Predicts.

EXPLANATION:

Prolonged viewing of violent TV programs leads to those viewing the violent programs to react in a violent manner to situations in routine life. When one watches a violent TV program in which a good character reacts violently to a situation, it is accepted by the viewers as the right way of dealing with situations. Therefore, it can be predicted that most viewers will react to the situation violently like the good character of the program.

Correlational studies suggest that prolonged viewing of televised violence predicts higher rates of violent behavior. This doesn't imply causation, meaning that other factors might also contribute.

Correlational studies show that prolonged viewing of televised violence predicts increase rates of violent behavior. Correlational studies observe a relationship between two or more variables without influencing either one of them. In this case, the variables in question are the prolonged viewing of televised violence and the increase in rates of violent behavior. This does not mean that watching violent television directly causes violent behavior. Rather, the research suggests that there is a possible relationship or association between the two. There may be other contributing factors involved, such as individual personality traits or environmental factors.

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