13. Jane wants to figure out which of two foods is the healthiest for her pet gerbil, Bob, so she decides to conduct an
experiment. She feeds Bob food A for two weeks and then measures how much Bob weighs. Then she switches the food to
gerbil food B for two weeks and measures how much Bob weighs. Throughout the experiment, she gives Bob the same
amount of water each day, and keeps the temperature in the room constant.
What is the independent variable in this experiment?

The classification of all living organisms into the three-domain system (Bacteria, Archaea, and Eukarya) is supported by a range of different types of evidence.

Comparative biochemistry: The three domains of life have fundamental biochemical differences that reflect their evolutionary history. For example, the enzymes and metabolic pathways of Archaea are more similar to those of Eukarya than to those of Bacteria, suggesting that Archaea are more closely related to Eukarya than to Bacteria.

Comparative genomics: Analysis of DNA and RNA sequences from different organisms has revealed a great deal about their evolutionary relationships. Comparisons of complete genomes have provided strong evidence that Bacteria, Archaea, and Eukarya are distinct domains of life.

Comparative morphology: Observations of the structure and form of cells and tissues of different organisms can provide evidence of evolutionary relationships. However, morphology alone is not sufficient to classify organisms into domains.

Biogeography: The distribution of organisms across the globe can provide evidence of their evolutionary history. For example, the distribution of certain groups of Archaea in extreme environments, such as hot springs or deep-sea hydrothermal vents, supports the hypothesis that these organisms represent ancient lineages of life.

Phylogenetic analysis: The study of the evolutionary relationships among organisms using molecular and genetic data has become a powerful tool for classification. By comparing DNA and RNA sequences, researchers can construct phylogenetic trees that show the evolutionary relationships among different organisms.

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Answer:

Plants store long term energy in their glucose until they need the energy to use it.

Explanation:

Answer:

The sugar and phosphate group make up the backbone of the DNA double helix, while the bases are located in the middle.

Explanation:

Answer:

our body needs to breathe we take oxygen and throw out carbondioxide.

Answer:

Anopheles mosquitoes

Explanation:

Malaria is a common disease characterized by symptoms that include: headache, fever, nausea etc. Malaria disease is caused by a pathogen called PLASMODIUM, which is a protozoan parasite. However, these plasmodium parasites are carried to induce their damage by vectors called MOSQUITOES.

Not all genus of mosquitoes carry this pathogen but specifically ANOPHELES MOSQUITOES. The female species of an Anopheles mosquito carries plasmodium when they feed (suck blood) of an infected person. They then inject it into the bloodstream of another victim they suck from.

Answer: D = 0.56 g/ml

Explanation:

We can use the density equation for this one.

D = m / v

We are given Mass (m) and Volume (v).

D = 4g / 7.1 ml

D = 0.56 g/ml

Answer:

Photosynthesis is the process by which plants use sunlight, water, and carbon dioxide to create oxygen and energy in the form of sugar.

ATP

ADP

CO2

SUGAR

What is Photosynthesis ?

            Plants and other living things employ a process called photosynthesis to transform light energy into chemical energy that can then be released through cellular respiration to power the organism's activities. Despite the fact that various species undertake photosynthesis in different ways, the process always starts when proteins called reaction centres that contain green chlorophyll absorb energy from light. Unlike bacteria, which have these proteins incorporated in the plasma membrane, plants store these proteins in organelles called chloroplasts, which are most prevalent in leaf cells.

          When the cell needs energy, ATP can be taken out and used to fuel processes or stored for use in later ones. Animals use ATP to retain the energy released during meal digestion. Similar to this, plants use ATP molecules to store the energy they obtain from light during photosynthesis.

           In addition to converting ADP to ATP, photosynthetic processes are used by plants to absorb, process, and store solar energy. Animals convert ADP to ATP, which can subsequently be utilised to drive essential development and cell maintenance, using the energy supplied from the breakdown of glucose and other molecules.

            Plants absorb water (H2O) and carbon dioxide (CO2) from the soil and atmosphere during photosynthesis. Water is oxidised, which means it loses electrons, while carbon dioxide is reduced, which means it receives electrons, inside the plant cell. Water is converted into oxygen and carbon dioxide into glucose as a result.

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Answer:

1. B

2. C

3. A

Explanation:

1. Most of the carbohydrates in the foods you eat are digested and broken down into glucose before entering the bloodstream. Glucose in the blood is taken up into your body's cells and used to produce a fuel molecule called adenosine triphosphate (ATP) through a series of complex processes known as cellular respiration.

2. Fats are known as being a long term energy source, and the fat on your body is used a "cushioning" for your bones.

3. To break a protein down into its amino acids you will need enzymes. Enzymes are biological molecules (proteins) that act as catalysts and help complex reactions occur everywhere in life.

Answer:

Answer: B: allowing a forest to grow wildly

Explanation:

The other ones (A & C) Have Human interaction, B explains that you are leaving the Environment alone, not building anything, not cutting anything, but letting nature take its course.

Choline was officially recognized as an essential nutrient by the Institute of Medicine in 1998. Its role in the body is complex. It is needed for neurotransmitter synthesis (acetylcholine), cell-membrane signaling (phospholipids), lipid transport (lipoproteins), and methyl-group metabolism (homocysteine reduction).

Answer:

Therefore, water is said to be a "polar" molecule, which means that there is an uneven distribution of electron density. A hydrogen bond is a non-covalent bond between a partial negative charge and a partial positive charge. Hydrogen bonds tend to be weak. Hydrogen bonds tend to be transient.

Based on that, I would say that A water molecule has a slight charge on each end.

Explanation:

If I am correct, can I please have brainliest?

Answer:

\(\boxed {\tt C. \ A \ water \ molecule \ has \ a \ slight \ charge \ on \ each \ end}\)

Explanation:

Water molecules are polar, which means the charge is not distributed evenly between the atoms.

The reason they are polar is the shape of molecule. Water molecules are bent and form a sort of "Mickey mouse" shape.

The negative charge from the oxygen is on one end of the molecule, but the positive charge coming from the hydrogen is on the other end of the molecule.

The water molecule gets a different charge on each end, so the best answer is choice C.

Answer:

a variety of genes are involved in the control of cell growth and division. the cell replicates itself in an organized, step by step fashion known as the cell cycle.

Explanation:

tight regulation of this process ensures a dividing cell's DNA is copied properly, any errors in the DNA are repaired and each daughter cell receives a full set of chromosomes.

Explanation:

pretty sure its c also nice pfp 0_0

Triclosan is a popular ingredient in cleaning products, specifically for killing bacteria, and is known for its antibacterial abilities.

After cleaning a desktop with a solution containing triclosan, it is very likely that live E. coli will not remain on the desktop. Many species of bacteria, including E. coli, have been successfully killed or prevented from growing by triclosan. The bacterial cell membrane is damaged by its mechanism of action, which also inhibits vital cellular processes.

While the addition of triclosan to the cleaning solution increases the likelihood of removing live E. coli, other elements and conditions must also be considered to determine the full effectiveness of the cleaning process.

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Answer:

mutation

Explanation:

occurs when a DNA gene is damaged or changed in such a way a to alter the genetic message carried by that gene. A mutation is an gent of substance that can bring about permanent alteration to the physical composition of a DNA gene such that the genetic message is changed

Answer:

Option A, Fixed quota models are risky because slight miscalculations can result in fish population extinction

Explanation:

Some of the major drawbacks of modelling fishing are as follows –  

a) The fixed quota model is very risky as a miniscule change in attributes can result into extinction of fish.  

b) On the other hand fixed effort harvesting can decrease the risk of fish population extinction

Hence, option A is correct

The testes of a human male produce gametes, while the process that produces new skin cells in the same individual differs from the process that produces these gametes.

Gametes are specialized cells that carry genetic material and are necessary for sexual reproduction. The process by which the testes of a human male produce gametes is known as spermatogenesis. This process involves the division of diploid germ cells to produce haploid sperm cells with half the number of chromosomes as the parent cell.On the other hand, the process that produces new skin cells in the same individual is known as mitosis. This process involves the division of somatic cells (cells that make up the body tissues) to produce two identical daughter cells with the same number of chromosomes as the parent cell.

Therefore, the process that produces gametes in males differs from the process that produces new skin cells in the same individual. While gametes are produced through the process of spermatogenesis, new skin cells are produced through the process of mitosis.

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The answer is option 2 oxygen

Answer:

delayed growth, episodes of pain, painful swelling of hands and feet, vision problems, frequent infections

Explanation:

By sending electrical impulses through neurons, the brain signals the body to move, activating the muscles that are responsible for movement.

The electrical impulses that travel between brain neurons are referred to as brain signals. For the brain to regulate and synchronise the body's movements, thoughts, and emotions, these messages are necessary. There are billions of neurons in the brain, and they all communicate with one another via a sophisticated network of synapses. A neuron sends off an electrical impulse that travels down its axon and causes the release of neurotransmitters when it receives a signal from another neuron. A new electrical impulse is then started when these neurotransmitters bind to receptors on the surface of additional neurons. The brain is able to regulate all facets of the body's behaviour and function, from simple physical movements to intricate cognitive functions, by sending and receiving these signals.

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Answer:

Health benefits of food and exercise.

Explanation:

Foods are the substances which provides energy for performing different activities in our daily life. These foods also prevent diseases because it contains many beneficial nutrients which makes our defense or immune system stronger and has the ability to defend our body against diseases. If foods which contain fats are eaten in large quantity so it occurs some diseases such as obesity and heart diseases due to blockage of valves which reduces the flow of blood to the heart. With the intake of food, exercise is also necessary which makes our body active and also reduces the risk of diseases by making our body stronger. So both nutritive food and exercise increase the health of our body.

Gene cloning is the process of making multiple copies of a gene (option a).

The process of gene cloning makes reference to a technique used in molecular biology laboratories aimed at generating millions of copies of a given nucleotide sequence in order to be used for different purposes such as for example identification of individuals within a population.

Therefore, with this data, we can see that the genetic process of Gene cloning is used in the laboratory to identify individuals and it involves making gene copies.

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Answer:

giraffe eat grass of field and leaves of tree.

Answer:

Acacia

Explanation:

fresh acacia leaves hung high in artificial food “trees,” as well as hay, carrots, and low-starch, high-fiber biscuits.

Based on a recombinant frequency of 24%, the percentage of testcross progeny that will be homozygous recessive (a bla b) is 38%.

Given:

Recombinant frequency = 24% = 0.24

Non-recombinant frequency = 100% - Recombinant frequency = 100% - 24% = 76% = 0.76

We know that the non-recombinant progeny will have the genotypes A B/A b or a B/a b. We are interested in the percentage of progeny with the genotype a B/a b, which represents the homozygous recessive (a bla b) individuals.

To calculate the percentage of testcross progeny that will be homozygous recessive:

Percentage of homozygous recessive = Percentage of non-recombinant progeny * Probability of having a B/a b genotype

Percentage of non-recombinant progeny = 0.76

Probability of having a B/a b genotype = 0.5 (since half of the non-recombinant progeny will have this genotype)

Percentage of homozygous recessive = 0.76 * 0.5 = 0.38 = 38%

Therefore, the calculation shows that 38% of the testcross progeny will be homozygous recessive (a bla b).

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Answer:

A

Explanation:

A. Carbon cycle

Cellular respiration is the metabolic reaction that occurs in the cells of organisms. Cellular respiration and photosynthesis both add carbon dioxide to the biogeochemical cycle. Thus, option A is correct.

The biogeochemical cycle is the process that transfers and moves the abiotic chemical factors through the various spheres of the earth. It includes carbon, water, nitrogen, phosphorus cycle, etc.

The process of cellular respiration releases carbon dioxide as the waste gas into the atmosphere that gets consumed by the plants to make energy that gets eaten by the organism that again releases the carbon dioxide. This cycle of carbon goes on from the producer to the consumer in the ecological chain.

Therefore, cellular respiration and photosynthesis contribute to the carbon cycle.

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Answer:

c ) the height of radish seedlings is measured

Explanation:

The quantitative observation from the given choices is the height of the radish seedling measured.

Observation is one of the most important steps in the scientific method. It is usually carried out with our six senses. Also, observations can be made with very specialized equipment.

Taking note of color, odor, etc are all qualitative observations.

Quantitative observations are taken for measurements.

Answer:

2 meters

Explanation:

on the table, the number to the left of 24 is 2, showing its 2 meters in 24 seconds

The mutations are common in the sense that about 5 nucleotides in 6.5 billion are changed during each replication (Option a).

The mutation rate refers to the number of nucleotide changes that emerge at each replication cycle of the DNA molecule, which varies between different types of organisms, especially when comparing prokaryotes and eukaryotes.

Therefore, with this data, we can see that the mutation rate is the number of alterations in the DNA molecule after replication and the number is variable between different groups of species in nature.

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In the premenstrual phase of the menstrual cycle, spiral arteries rhythmically constrict and dilate causing endometrial ischemia.

A woman's body undergoes a variety of changes each month in the years leading up to menopause in order to prepare for a potential pregnancy. The menstrual cycle is the name given to this string of hormonally induced events. An egg develops and is discharged from the ovaries once per menstrual cycle. The uterus' lining thickens throughout time. The uterine lining sheds during a menstrual cycle if there is no pregnancy. Then the cycle resumes. The four stages of a woman's menstrual cycle are as follows:

- menstrual phase

- follicular phase

- ovulation phase

- luteal phase.

Each phase's duration can vary from woman to woman and over the course of time.

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Answer:

true and true

Explanation: