Gradualism describes the rates of speciation. It means that evolutionary changes in species are slow, gradual and continuous process. In our example, The one-toed horse of today steadily evolved from its five-toed ancestor. Steadily is the key word. So, the change was slow and continuous process.
If the change were rapid, this would be an example of punctuated equilibrium.
Ribbon-like acoelomates with bilateral symmetry are examples of _____.
Cnidarians: jellyfish
Platyhelminthes: flat worms
Nemotoda: round worms
Mollusca: mollusks
Annelida: segmented worms
Answer:
The correct answer is platyhelminthes: flatworms.
Explanation:
Platyhelminthes are generally known as tapeworms or flatworms, these species are ribbon-like and are soft-bodied invertebrates. Some of the species of this phylum live as parasites in animals and human beings. The most distinguishing characteristic of these invertebrates is their flat and ribbon-like appearance.
Some of the characteristics of Platyhelminthes are that their body is dorsoventrally flattened, they show radial symmetry, they do not possess a body cavity and thus are known as acoelomate, they are triploblastic comprising three germ layers, and their body is soft and unsegmented.
Match these terms and definitions.!!!!!!!!!!!!!!!!!
1. forms the pole of the spindle apparatus
2.the membrane that surrounds the nucleus of the cell
3. having chromosomes that occur singly, not in matched sets or pairs
4. matched units of DNA containing genetic information
5. produces daughter cells with fewer chromosomes than the parent cell
6. a system of fibers that go from one end of the cell to the other
7. period of mitosis in which chromosomes move to opposite poles of the cell
8. method of cytokinesis in animals
9. threadlike substance in nucleus which carries genetic information
10. period when the cell is not engaged in division
A. spindle apparatus
B.meiosis
C.haploid
D.homologous chromosomes
E.nuclear envelope
F.anaphase
G.chromatin
H.furrowing
I.centriole
J.interphase
The terms provided correspond to different components and phases associated with cell division. Matching the terms to their definitions helps to understand the process of cell replication, involving the mitotic and meiotic divisions.
Let's match the given terms and their correct definitions:
Centriole forms the pole of the spindle apparatus.The nuclear envelope is the membrane that surrounds the nucleus of the cell.Haploid refers to having chromosomes that occur singly, not in matched sets or pairs.Homologous chromosomes are matched units of DNA containing genetic information.Meiosis produces daughter cells with fewer chromosomes than the parent cell.A spindle apparatus is a system of fibers that go from one end of the cell to the other.Anaphase is the period of mitosis in which chromosomes move to opposite poles of the cell.Furrowing is the method of cytokinesis in animals.Chromatin is the threadlike substance in nucleus which carries genetic information.Interphase is the period when the cell is not engaged in division, one of the two major parts of the cell cycle; consists of G1, S, and G2 stages.In general, what factors are most likely to reject the null hypothesis for an anova?
To reject the null hypothesis in ANOVA, the p-value must be less than the chosen significance level, indicating significant differences between group means and fulfilling assumptions of the analysis.
Explanation:The factors most likely to lead to the rejection of the null hypothesis in an ANOVA test include a large between-group variance compared to within-group variance, resulting in a high F-statistic, and ultimately a p-value that is smaller than the predetermined significance level, often α = 0.05. To reject the null hypothesis, the ANOVA results should show that the probability of observing the data if the null hypothesis were true (the p-value) is less than the threshold α, suggesting that the group means are statistically significantly different and that at least one group mean is not equal to the others. It is critical to meet the assumptions of ANOVA, which include independence of observations, normally distributed populations, equal variances, and random sampling.
The refrigerator has no room to cool the meat I just cooked what should i do
Which of the following is most likely to be amorphous?
glass
solid sulfur
solid calcium
gold
Answer:
Glass
Explanation:
Has no clearly defined shape.
I hope it helps.
Dna is a specialized carbohydrate contained within cells. t f
a grapevine growing around a fence post is an example of?
A- phototropism
B-photoperiodism
C- geotropism
D- thigmotropism
Tropism is plant growth in a response to a stimulus.
Through the process of elimination:
A - phototropism is plant growth in a response to light.
B - Photoperiodism is an organism reaction to the lengths of days and nights.
C - Gravitropism is plant growth in a response to gravity.
D - Thigmotropism is plant growth in a response to contactFinal answer:
A grapevine wrapping around a fence post is an example of thigmotropism, which is a plant's growth response to touch or physical contact.
Explanation:
A grapevine growing around a fence post is an example of thigmotropism. This term refers to the directional growth that plants exhibit in response to touch or physical contact. When the grapevine encounters the solid structure of the fence post, it produces a growth response that causes it to wrap around or climb the post. This is different from phototropism, which is growth in response to light, geotropism (also known as gravitropism), which is growth in response to gravity, and photoperiodism, which refers to changes in biological activities based on the length of day and night.
The human nervous system is broken up into central and peripheral parts. The central system (CNS) is made up of _____.
a. the brain and the spinal cord
b. sensory and motor neurons
c. the brain and motor neurons
The answer is a. the brain and the spinal cord
The two main parts of the central nervous system are brain and spinal cord. The spinal cord serves as the main communication link between the body and the brain. The spinal cord receives information from the body and relays it to the brain, and vice versa, it receives information from the brain and relays it out to the effectors.
Which of these is a property of bases?
They produce hydrogen gas when reacted with metals.
They feel sticky.
They turn litmus paper blue.
They taste sour.
a group of students is counting the number of plastic bags placed in a landfill during a single day. what are the students doing?
A. starting a promblem
b. drawing a conclusion
c. making a hypothesis
d. collecting data
by the way this is ecology!!
Answer: d. collecting data
Explanation:
A typical research design includes a research problem, a testable hypothesis, dependent and independent variables, data collection, experimental methodology and plan for statistical analysis.
According to the given situation, students are collecting the plastic bags from the landfill means they are collecting the data for study.
Overpopulation impacts the environment primarily by
limiting land available for crops.
destroying natural resources.
causing the removal of trees.
interfering with normal plant growth.
Overpopulation leads to the destruction of natural resources due to increased demands for essentials such as land, water, and energy, causing deforestation, strain on agricultural lands, and exacerbating global warming.
Overpopulation impacts the environment primarily by destroying natural resources. This destruction comes from an incremental demand for land, water, food, and energy. As human populations soar, more areas are settled, leading to deforestation, the extinction of species, and decreased land availability for agriculture. Forests, which serve as a critical fuel resource and building material, freshwater supplies, and agricultural soils become overtaxed and their depletion leads to grave environmental consequences. Moreover, overpopulation contributes to global warming and heightened competition for finite resources of energy, which could lead to potential political and social unrest.
What do biologists studie?
Why is it important that the inside of a lysosome have a lower pH than the surrounding cytoplasm in the cell?
Answer
The digestive enzymes in the lysosome work best at a lower pH.
The protein molecules constructed in the lysosome form best at a lower pH.
The substances stored in a lysosome are most stable at a lower pH.
The waste products stored in the lysosome require a lower pH.
The inside of a lysosome has a lower pH than the surrounding cytoplasm because the digestive enzymes in the lysosome work best at a lower pH. The lower pH is maintained by proton pumps in the lysosome membrane.
Explanation:The inside of a lysosome has a lower pH than the surrounding cytoplasm because the digestive enzymes in the lysosome work best at a lower pH. These enzymes, called acid hydrolases, catalyze hydrolysis reactions and their optimal pH is around 4.5. The lower pH inside the lysosome is maintained by proton pumps in the lysosome membrane that pump protons in, creating an acidic environment.
Organisms must maintain homeostasis because cells function best when internal conditions
A) change at regular intervals
B) remain within a limited range
C) reflect external conditions
D) respond to positive feedback
The sanderling is a shorebird that feeds on insects and small crustaceans such as crabs. Sanderlings that are beyond breeding age often stay in the southern feeding grounds and do not migrate north during spring and summer. What is the most likely reason that nonbreeding sanderlings remain in the southern feeding grounds?
They are more vulnerable to predators in the tundra region than breeding sanderlings.
They have enough food in the tropical region and are no longer searching for mates.
They have adapted to the warmer weather.
They rear their young on the southern coast.
Answer: They have enough food in the tropical region and are no longer searching for mates.
Explanation:
The Sanderling is a energetic, small and plump wading bird. It posses medium length legs which are black and short straight black bill. It is white underneath and pale grey above. It is native of southern UK but migrate to the coastal regions of south during spring for breeding.
According to the given situation, the members of the Sanderling population which are beyond the breeding age do not migrate as they have enough food and they have lost the tendency to copulate and search the mates.
Caitlin wants to determine if a tomato plant grows better in potting soil or dirt. Which of the following describes the best set up to conduct this type of investigation? 2 pots of the same size: one with 1 pound of potting soil, one with 2 pounds of dirt, 2 tomato plants of the same size and type 2 pots of different sizes: one with 2 pounds of potting soil, one with 2 pounds of dirt, 2 tomato plants of the same size and type 2 pots of the same size: one with 2 pounds of potting soil, one with 2 pounds of dirt, 2 tomato plants of the same size and type 2 pots of the same size: one with 2 pounds of potting soil, one with 2 pounds of dirt, 2 tomato plants of different sizes and the same type
Almost any article on plants ends with "and make sure you use a good potting mix" - great advice, but what does it mean? Let’s go over some of the basics and see if we can answer that question. To know what a good potting mix is you kind of need to know what the purpose of a potting mix is, so let’s discuss that first. The main functions of a potting mix are:
To hold moisture and nutrients around your plants roots, acting as a reservoir for these critical elements of life in your container garden.To provide enough air for growing roots to be able to breath and not rot once you plant your container. Most people don’t think about this, but it is critical to have a good amount of air in the soil. Not enough and usually the plant roots have a hard time surviving.To support your plant, providing anchorage for the roots. A soil mix needs to settle around the roots of your plant and help hold it in place, so that it doesn’t blow over from the first wind. However, it also needs to be light enough to allow water and air to always be present under the soil surface so your plant’s roots have a balanced atmosphere to grow in.So given that a good potting mix does these things, any number of different materials can be used. I know many gardeners use soil from their garden in their pots, some make their own compost and add this to their containers. You can do any of these things, but if you are making your own potting soil at home you will also need to change the way you water and fertilize in order to get the best results. From hydroponics to sewer sludge, there are a million ways to mix up a potting soil, however, the potting soil you buy at most garden centers is a simpler blend of some basic items.
ules of Thumb For Choosing a Potting Soil:
Potting soil used in containers should be light and fluffy.Answer:
2 tomato plants of the same size and type 2 pots of the same size: one with 2 pounds of potting soil, one with 2 pounds of dirt.
Explanation:
In order for Caitilin to be able to conclude whether tomato plants grow more soil or dirt vessels, she will need to establish a controlled experiment, which is a scientific test carried out under controlled conditions, where the factors tested are in equal conditions.
In other words, in order to test the efficiency of earthen vessels and dirt vessels, Caitilin must provide these vessels with equal conditions, so that she can evaluate their results and decide which one was the best. In this case, she will need to use: 2 tomato plants of the same size and type 2 pots of the same size: one with 2 pounds of potting soil, one with 2 pounds of dirt.
When two experiments are identical except for one variable, the experiment is called a(n) _____.
What trait enables an organism to keep its internal body temperature constant?
orgothermy
exothermy
endothermy
homothermy
Endothermy is the proper term for this. I got a 100% on the test.
Which color has the longest wavelength?
A. red
B. black
C. violet
Which type of evidence is least likely to result in changes to a phylogenetic tree?
Which of the following is the slowest form of mass wasting?
A) slump
B) slide
C) creep
D) fall
The slowest form of mass wasting, a geological process of moving soil, rock, and sediment downhill, is creep because it occurs very slowly over years or decades.
Explanation:The slowest form of mass wasting among the options provided in your question is creep. Mass wasting, also known as mass movement, refers to the process that moves soil, rock, and sediment downhill due to the force of gravity. It is a geological process that occurs when the stability of a slope is weakened, causing the materials on it to move down. Among the types of mass wasting, slump, slide, fall, and creep, the slowest one is creep. Creep is a very slow, persistent mass movement of surface soil. It occurs over years or decades, making it the slowest form of mass wasting.
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Describe the differences between spermatogenesis and oogenesis.
Spermatogenesis is the continuous process of producing four haploid sperm cells from each germ cell in males, starting at puberty. Oogenesis produces one mature ovum and three polar bodies from each germ cell in females, with the process beginning before birth and the release of ova being cyclic after puberty.
The process of forming gametes in humans involves two primary processes: spermatogenesis and oogenesis. Both these processes are forms of gametogenesis, which is the production of gametes (sex cells) through the process of meiosis. However, they occur in different genders and have distinct characteristics.
Spermatogenesis is the process by which sperm cells are produced in males. It takes place in the testes and follows meiosis, resulting in four haploid sperm cells from a single germ cell. This continuous process begins at puberty and happens throughout the male's life.
In contrast, oogenesis is the process of egg cell production in females. Occurring in the ovaries, it also involves meiosis, but rather than producing four viable gametes, it results in one mature ovum and three non-functional polar bodies. The process begins before birth with all ova a female will ever have, and the release of mature eggs occurs cyclically after puberty until menopause.
Which component of the DNA molecule provides instructions for protein production?
A deoxyribose sugar molecules
B sequence of nitrogen bases
Answer:
B sequence of nitrogen bases
Explanation:
The instructions that determine all the characteristics and functions of an organism are found in its genetic material: DNA (deoxyribonucleic acid).
The knowledge of DNA, its structure and function, was decisive for the development of modern biotechnology.
Proteins are macromolecules that fulfill varied functions. There are structural proteins, others are enzymes, others carry oxygen such as hemoglobin, there are proteins involved in immune defense, such as antibodies, others perform functions of hormones such as insulin, etc.
Just as DNA is composed of nucleotides, proteins are composed of amino acids. There are 20 different amino acids, and each protein has a particular amino acid sequence that depends on the sequence of nitrogen bases present in the DNA.
The protein synthesis process basically consists of two stages: transcription and translation. In the first stage, the "words" (genes) written in the DNA in the language of the nucleotides are copied or transcribed to another molecule, the messenger RNA (mRNA). Then, in the next stage, the mRNA is translated into the language of the proteins, that of the amino acids. This flow of information is known as the "central dogma of biology."
Which of the following wave properties would be the best way to measure the height of a wave?
A) amplitude
B) frequency
C)equilibrium
D)trough
Answer:
A
Explanation:
Scientis treats a cell with a chemical that destroys the ribosomes. As a result, which cell process will be stopped?
Treating a cell with a chemical that destroys ribosomes stops translation, as the ribosomes are critical for protein synthesis. In the case of a nonfunctional 60S ribosomal subunit, translation would stall, preventing the formation of proteins and potentially leading to cell dysfunction or death.
If a scientist treats a cell with a chemical that destroys the ribosomes, the process that will be stopped is protein synthesis or translation. Ribosomes are essential to the process of translation, where messenger RNA (mRNA) is translated to form polypeptide chains, which then fold into proteins.
Specifically, in the scenario where a mutation makes the 60S ribosomal subunit nonfunctional in a human cell line, the predicted effect on translation is that it would stall shortly after the initiation AUG codon is identified. Without the functional 60S subunit, the ribosome cannot effectively join amino acids to form a polypeptide chain. This inhibits the production of proteins, which are crucial for numerous cellular functions and can lead to severe cellular dysfunctions or cell death.
what molecules in plant cells first captures the radiant energy from sunlight?
a. glucose
b. carbon dioxide
c. chlorophyll
d. adenosine triphosphate
How are the building blocks of organic molecules like bricks?
The building blocks of organic molecules are like bricks because they can be combined in various ways to create different structures.
Explanation:The building blocks of organic molecules are like bricks because they can be combined in various ways to create different structures, just like bricks can be arranged to build different types of structures. Organic molecules are made up of carbon atoms bonded to other elements such as hydrogen, oxygen, nitrogen, and sulfur. These atoms can combine in different arrangements to form different types of organic molecules, just like bricks can be arranged in different patterns to build different structures.
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3 steps of a nervous system reaction
Summarize briefly the process of photosynthesis from absorption of light to production of glucose ?
Final answer:
Photosynthesis is a multi-step process that converts carbon dioxide and water into sugars like glucose using sunlight and releases oxygen as a byproduct. It involves light-dependent reactions and the Calvin cycle. Sunlight initiates the reaction by energizing chlorophyll, leading to the production of glucose and other sugars from carbon dioxide.
Explanation:
Overview of Photosynthesis
Photosynthesis is a complex, multi-step process that begins with the absorption of sunlight by chlorophyll within the leaves of plants. Carbon dioxide and water serve as substrates in this reaction. Through a series of reactions, this process converts water and low-energy carbon dioxide molecules into high-energy sugar molecules like glucose and releases oxygen as a byproduct. This transformation occurs within the chloroplasts—the photosynthetic organelles of the plant cells.
Initially, the energy from sunlight is captured and used to convert water into oxygen and energy-rich molecules like ATP and NADPH. This stage of photosynthesis is often referred to as the light-dependent reactions because it requires sunlight. Subsequently, these energy-rich molecules are used in the Calvin cycle, which is a series of light-independent reactions. During the Calvin cycle, carbon dioxide is fixed into glyceraldehyde-3-phosphate (G₃P or GA₃P), which can then be converted into glucose or other sugars. These sugars not only serve as an immediate source of energy for plants but also act as building blocks for other organic compounds that are vital for growth and development.
DNA technology in agriculture.