Genetic drift is change in the allele frequency of a population due to....
natural selection
artificial selection
non-random
mating (sexual
selection)
random chance
(it’s a quizzical plss)

Answer:

The ozone layer protects harmful rays

Explanation:

When the ozone layer is depleted, UV rays from the sun enter the earths atmosphere, and becasue the ozone layer was replaced by greenhouse gases, they trap the suns rays in between the earths atmosphere, increasing earths temperature

A pencil is commonly used to draw the baseline straight across the TLC plate at least 1-2 cm from the bottom of the plate because pencil markings are stable.

When performing Thin Layer Chromatography (TLC), the baseline is an important reference point used to measure the migration distance of the analyte spots. A pencil is commonly used to draw the baseline straight across the TLC plate at least 1-2 cm from the bottom of the plate for several reasons:

1. Pencil markings are non-reactive: Pencil marks are made using graphite, which is non-reactive and does not interfere with the separation or analysis of the analyte. Other writing instruments, such as pens or markers, may contain chemicals that could contaminate the sample or interfere with the chromatographic process.

2. Pencil markings are stable: Pencil marks are relatively stable and do not easily dissolve or smudge when the plate is exposed to solvents during the chromatographic process. This ensures that the baseline remains visible and intact throughout the separation.

3. Pencil marks are easily visible: Pencil marks are typically dark and contrasting against the TLC plate's surface, making it easier to identify and measure the migration distances accurately. The baseline should be clearly visible to ensure precise measurements of spot migration.

4. Adequate distance from the bottom of the plate: By drawing the baseline at least 1-2 cm from the bottom of the plate, you provide sufficient space for the solvent to migrate and carry the analyte spots without interfering with the baseline. This distance allows for a clear separation between the baseline and the spots, making it easier to measure their migration distances accurately.

Overall, using a pencil to trace the baseline straight across the TLC plate at an appropriate distance from the bottom ensures visibility, stability, and non-interference with the chromatographic process, allowing for accurate measurements and analysis.

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This statement is false, ovulation occurs about midway through the menstrual cycle, after the follicular phase.

The follicular phase represents the first half of the ovarian cycle. The development of follicles on the surface of the ovary is triggered by gradually increasing FSH and LH levels. The eggs are made ready for ovulation in this step. The follicles start to release oestrogens and a small amount of progesterone as they develop. The endometrium is kept healthy by progesterone to assist assure pregnancy. It takes around seven days for the fallopian tube to travel. There are between 30 and 60 cells in the morula, which is this stage of development.

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Answer:

B. The foam has tiny air pockets that slow the transfer of thermal

energy away from the water in the pipe

Explanation:

Air is a poor conductor thermal energy and can be used as good insulator. Insulators are poor conductors of heat.

When it is freezing outside, the temperature gradient will tend to adjust to the ambient one. The water in the pipe being at a higher temperature will tend to lose heat energy to the surrounding.

The layer of foam will prevent this form of heat exchange from happening because of the air pocket that is present around.

Answer:

B. The foam has tiny air pockets that slow the transfer of thermal

energy away from the water in the pipe

Explanation:

Air cannot conduct heat well and can be used as a good insulator. Poor heat conduction of the insulator. When it is cold outside, the temperature gradient will adapt to the environment. The temperature of the water in the pipe is relatively high. It loses heat to the environment. The foam layer prevents this form of heat exchange due to surrounding air pockets.

D. Of the six layers of fossils analyzed, we only know that the top layer is the youngest because layers below it were deposited randomly without any systematic pattern.

In the Nevada lake quarry, the age of the sediment layers is determined by the order in which they were deposited, with the youngest layers at the top and the oldest layers at the bottom. The top layer of sediment was likely deposited last, and therefore it is the youngest. The other options do not accurately reflect the relationship between age and position of sediment layers in the quarry.  

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Answer:

true

Explanation:

When two species compete with one another for the same resource, their niches overlap. Resource partitioning reduces the number of species that can share a given resource. Some bats prey on certain moths, hunting them using echolocation. i.e. bats, have evolved to change the frequency they use for echolocation.

To find a way to lower mosquito populations in the wild and increase cases of malaria in the future the purpose of using CRISPR in the Anopheles gambiae mosquitoes experiment.

The malaria parasite, which is spread by infected mosquitoes, multiplies inside red blood cells after entering the human bloodstream. After a few days, these cells burst, infecting other red blood cells and resulting in symptoms such as a severe headache, nausea, vomiting, fever, and coma.

A plasmodium-genus single-celled parasite, which causes malaria. Most frequently, mosquito bites are the means of parasite transmission to people.

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Answer:

protista get energy through photosynthesis

Cellular Respiration

Glycolysis and Krebs,

The powerhouse within our cells

To turn fuel into energy,

The power that never fails.

Pyruvate oxidation,

The breakdown of molecules

To create energy from glucose

And keep our cells in control.

The electron transport chain

Is the last step in respiration

Releasing energy from electrons

To keep our bodies in motion.

Photosynthesis

Plants take in the sun's light

Gathering energy for the night

Using carbon dioxide and water

To create sugar for a tight fight.

From light energy to chemical,

The energy is stored as glucose

Through a process of reactions

For the plants to use as fuel.

The Calvin Cycle is the main event

Using ATP and NADPH

To turn the newly created sugar

Into the energy we all need.

Answer:

photosynthesis

Explanation:

plant need carbon dioxide to make me photosynthesis

Answer:

Photosynthesis

Explanation:

Plants need carbondioxide in order to photosynthesize

Answer:

C- the enzyme is represented by the letter C

Explanation:

Answer:

The hip adductors are a group of five muscles located in the medial compartment of the thigh. These muscles are the adductor longus, adductor brevis, adductor magnus, gracilis, and pectineus.

Explanation:

medial compartment of the thigh

obturator externus muscle.

gracilis muscle.

adductor longus muscle.

adductor brevis muscle.

adductor magnus muscle.

adductor minimus muscle.

A fossil that has one-sixteenth the normal production of carbon-14 to carbon-12 is most likely very old. This is because carbon-14 has a relatively short half-life of 5730 years, meaning that after this amount of time, half of the amount of carbon-14 in an organism or object would have already decayed.

Since the fossil being discussed has one-sixteenth of the normal production of carbon-14 to carbon-12, this would suggest the fossil is at least 8 times the half-life, or 45,840 years old. Carbon-14 is necessary to measure the age of an object, and due to the fact that this fossil has only one-sixteenth of the normal carbon-14, it can be deduced that it is very old.

It is also possible that the fossil is much older than this calculation, but because of the short half-life of carbon-14, any other amounts which may have been present before the 45,840 year mark has decayed away. In conclusion, a fossil that has one-sixteenth the normal production of carbon-14 to carbon-12 is estimated to be 45,840 years old or older.

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Answer:

d

Explanation:

The direction of the reaction.

Answer:

Reactants: Carbon Dioxide, Light Energy, Water

Products: Glucose, Oxygen

Explanation:

The statements that are given are:

- Initially most weight loss from a low carbohydrate diet can be attributed to fat loss: True
- Enzymes are protein molecules that are needed to break down macronutrients: True


Initially most weight loss from a low carbohydrate diet can be attributed to fat loss: True

Initially, most weight loss from a low carbohydrate diet can be attributed to fat loss. This is because, in the absence of carbohydrates, the body shifts to using fat for energy. Fat is the body's main fuel source, so the more you burn, the more weight you lose.

Enzymes are protein molecules that are needed to break down macronutrients: True

Enzymes are protein molecules that are needed to break down macronutrients. Each enzyme is specific to a particular macronutrient. For example, amylase breaks down carbohydrates, protease breaks down protein, and lipase breaks down fat. Without enzymes, macronutrients would not be absorbed and utilized by the body.

Therefore, both statements are true.

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When a red blood cell is placed in an isotonic solution, there will be no net movement of the water. Both the concentration of the solute and the water are equal to both the intracellularly and the extracellularly; therefore, there will be no net movement of the water towards the solution or the cell.

The isotonic solution, Solutions that is contain the same concentration of the water and the solutes as the cell cytoplasm are called isotonic solutions. The Cells is placed in an isotonic solution that will neither shrink nor they swell since there is no net gain or the loss of water. the Isotonic solutions contain an electrolyte balance similar to the plasma in the bloodstream. When the isotonic solution is administered, the fluid of volume of the patient is also increased without a fluid shift. the Common examples of the isotonic solutions are about 0.9% normal saline and lactated ringers.

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Answer:

The lens of the eye is held in place by the iris

Explanation:

hope it helps you

Answer:

Ciliary Muscles

Explanation:

The muscles hold the lens in place but they also play an important role in vision. When the muscles relax, they pull on and flatten the lens, allowing the eye to see objects that are far away.

The plateau portion of the action potential in contractile cardiac muscle cells is due to the membrane potential remaining almost constant.

As the membrane gradually repolarizes This will be brought on by the nearly equal movement of charge into as well as outside of the cell.

As a result of this activity, the action potential reaches a plateau because a significant amount of calcium and sodium ions are transported through these channels towards the interior of such cardiac muscle fiber.

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Answer:

Gregor Mendel

Explanation:

Gregor Mendel fue un naturalista, biogista y matemático que demostró por primera vez los principios de la herencia utilizando su trabajo sobre las plantas de guisantes.

Publicó su trabajo en "Experiments in Plant Hybridization" en el año 1866. Al controlar la polinización, Mendel pudo cruzar plantas de guisantes con diferentes formas de rasgos. En el primer conjunto de experimentos de Mendel, experimentó con solo una característica a la vez. Los resultados de este conjunto de experimentos llevaron a la primera ley de herencia de Mendel llamada ley de segregación (Bio Libretexts).

Coal deposits that are deep underground must be extracted by subsurface mining rather than by strip-mining because strip-mining would Require removal of large amounts of rock and soil.

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Answer:

Neuroscience.

Explanation:

Neuroscience is the branch of life sciences which involves the scientific study of structure and function of the brain and nervous system, including neurons, nerves, and nervous tissue. People who study neurosciences is known as neuroscientist. Neuroscientists focus on the human's brain and its impact on the behavior and cognitive functions. Not only is neuroscience concerned with the normal functioning of the nervous system but also concern with neurological, psychiatric and neurodevelopmental disorders.

Phosphorylation of proteins can alter gene expression in a variety of ways. Phosphorylation is the process of adding a phosphate group to a protein, which can cause structural and functional changes.

This can lead to changes in gene expression in many ways.

First, phosphorylation can affect the stability of the protein. If a protein is phosphorylated, it can become more stable, which can then lead to increased levels of the protein in the cell, and therefore increased expression of the gene that encodes it.

Second, phosphorylation can affect the activity of the protein. If a protein is phosphorylated, it can become activated or inhibited, which can in turn lead to changes in the expression of the gene that encodes it.

Third, phosphorylation can affect the localization of the protein. If a protein is phosphorylated, it can become localized to a different region of the cell, which can also lead to changes in the expression of the gene that encodes it.

In conclusion, phosphorylation of proteins can alter gene expression in many ways, including affecting the stability, activity, and localization of the proteins. This can then lead to increased or decreased expression of the gene that encodes the protein.

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In the movie, predatory behaviour is depicted as the selection pressure that caused freshwater stickleback fish to lose their pelvic spines.

Pelvic spines increased a species' susceptibility to predators in their watery habitat, therefore those with fewer or no spines had a greater chance of surviving and reproducing. Freshwater stickleback fish have fewer or no pelvic spines as a result of this process of evolution.

According to the film, the selective pressure that led to freshwater stickleback fish losing their pelvic spines was the presence of predatory birds that could easily catch and eat the fish with larger spines. Over time, the fish with smaller or no spines were more likely to survive and reproduce, passing on their traits to their offspring, and eventually resulting in a population of stickleback fish with reduced or absent pelvic spines in freshwater habitats.

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Answer:

metaphase of mitosis

Explanation:

have a nice day and stay safe c:

The macula densa cells monitor the NaCl content of the filtrate entering the distal convoluted tubule.

Define juxtaglomerular apparatus.

The juxtaglomerular apparatus, often referred to as the juxtaglomerular complex, is a kidney structure that controls how each nephron, or functional unit of the kidney, performs.

What are macula densa cells ?

According to the traditional paradigm, the distal nephron's macula densa cells serve as salt sensors and send chemical signals to the juxtaglomerular apparatus to regulate key kidney activities like renal blood flow, glomerular filtration, and renin release.

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Answer:

It allows things in and out, similar to a cell membrane but it still provides protection

Explanation:

Answer:

They discovered cells.

Explanation:

Answer:

i cant do this i can only type

Explanation: