A reaction time contest is held. While most competitors had an average sound reaction time between 0.17 and 0.20 seconds, one person scored a fantastic 0.0713 seconds on average. The results of this test are shown below. What is the most likely explanation of this unusually low average time?

A. The subject frank a beverage with a lot of caffeine just before the contest.

B. The subject had very warm arms and hands.

C. The subject was an avid video game player.

D. None of the above.

Answer:T-cells are a type of white blood cell that work with macrophages. Unlike macrophages that can attack any invading cell or virus, each T-cell can fight only one type of virus. You might think this means macrophages are stronger than T-cells, but they aren’t. Instead, T-cells are like a special forces unit that fights only one kind of virus that might be attacking your body.The T-cell receptor fits with its antigen like a complex key. When the perfectly shaped virus antigen on an infected cell fits into the Killer T-cell receptor, the T-cell releases perforin and cytotoxins. ... Cytotoxins go directly inside the cell through this pore, destroying it and any viruses inside.

Explanation:

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Cell membrane have been the selective membrane that allows transportation. Sodium and potassium ions need a protein pump as they are charged particles that move against the gradient and need energy. Thus, option D is correct.

Active transport has been the way to move ions and molecules inside and outside the cell membrane. This system of transportation requires energy as the ions move from low concentration regions to the region of the higher electrochemical area.

The sodium and potassium pump needs proteins and energy to move the ions as the inside of the cell is rich in potassium and the exterior is rich in sodium ions. The charged ions moving against the concentration cannot enter the cell without energy and protein pumps.

Therefore, option D. all of the above statements are correct.

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Answer:

In order for something to be classified as living, it must grow and develop, use energy, reproduce, be made of cells, respond to its environment, and adapt. While many things meet one or more of these criteria, a living thing must meet all of the criteria.

Answer:

B) XRxr XrY

XRXr,XRY,XrXr,XrY

Genotype ratio:1:1:1:1

Phenotype ratio: 2:2 50% white, 50% red

C) XRXR, XrY

XRXr,XRY,XRXr,XRY

Genotype: 2:2

Phenotype: 100% white

D) XRXR,XRY

XRXR,XRXR,XRY,XRY

Genotype: 2:2

Phenotype: 100% white

Answer:

A?

Explanation:

The first step of protein synthesis is transcription, and transcription occurs in the nucleus of the cell... so...

"Human cells that contain one set of 23 chromosomes are called gametes, or sex cells; these eggs and sperm are designated n, or haploid. The matched pairs of chromosomes in a diploid organism are called homologous chromosomes."

Answer:

They have homologous structures because they have a common ancestor.

homologous structures because they have a common ancestor is the most likely reason that horses and mountain goats have hooves.

Homologous structures shoe the same structure, but may have a distinct  function, it indicate a common ancestor.

A homologous structure is an organ or bone seen  common between different animals that demonstrates an anatomical commonality indicating that the animals share a common ancestor.

on the other hand analogous structures where two unrelated species have structures with similar forms or functions due to convergent evolution.

for example of a homologous structure is the wing of a bird and an insect.

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Budding - It is a type of asexual reproduction where in a daughter organism is formed from a small projection known as bud. it develops as an outgrowth due to the repeated cell division on the parent body. when fully grown it detects to grow into a new independent individual

For.eg. hydra

Vegetative Propagation - it is a type of axle plant reproduction in which new plans are obtained from a part of the parent plant. under favorable conditions various touch to take part in the type of reproduction.this is known as natural vegetative propagation where plants parts like root stem and leaves develop into new plants

the property of vegetative propagation is used in cutting tearing and grafting these are known as the method of artificial vegetative propagation. they are used for many plants like sugarcane , rose, etc

hope it helped u

Answer:

We are only given one leaf, but the leaves in layer D of the same species would not be identical. Some of them could have deeper indentations or fewer indentations. A wider leaf surface area lets a plant absorb more sunlight, so it would be an advantage if leaves have fewer indentations.

The plants with fewer indentations will reproduce more, passing on their genes for fewer indentations. This repeats for a long time, then plant leaves overall would only have very small indentations (like the leaf for layer B).

Explanation:

There are mutations and variations that make one organism different from another organism, even if they're the same species.

Natural selection is when the environment "chooses" the organisms that have an advantage in the environment to reproduce. Organisms that are selected to reproduce can pass on their genes to future generations.

The deep indentation leaves from layer D were basically "phased out".

Answer:

Cheetahs and lions

Explanation:

They feed on the same prey. Therefore, if they live in the same area, one or both species will have less food. You might expect them to fight each other over food, but they do not.

Answer:

Cheetah And Lions can you mark me Brainlest?

Answer:

top left:

      T      T

T    TT    TT

T    TT     TT

1) dominant tall 2) dominant tall 3) dominant tall 4) dominant tall

top right:

    T      t

T   TT    Tt

t    Tt     tt

1) dominant tall 2) mixed hybrid 3) mixed hybrid 4) recessive short

bottom left:

      T     T

T   TT    TT

t    Tt      Tt

1) dominant tall 2) dominant tall 3) mixed hybrid 4) mixed hybrid

bottom right:

      t     t

t     tt    tt

t     tt    tt

1) recessive short 2) recessive short 3)recessive short 4) recessive short

Answer:

its A

Explanation:

Answer:

A

Explanation:

Answer:

cell division

Explanation:

This is where cells would get damaged or die and this process calls cell division occurs

Answer:

cell division,the process of mitosis

Answer:

The Answer Is A.

Explanation:

If They Can Be Used For Cleaning Up Mining Waste And For Sewage Treatment, That Makes Them A Good Thing. So It Wouldn't Be A Concern. Hope This Helps.

Genetically engineered bacteria cells can be used to clean up mining waste and for sewage treatment, which is not an ethical concern raised by genetic engineering. So, the correct option is A.

Genetic engineering may be defined as a process that involves the manipulation of the genetic material of organisms with help of lab-based technologies.

Bacterial species produced by genetic engineering used in cleaning up mining waste and sewage treatment benefit the atmosphere by reducing the level of waste and toxic compounds from suuroundings. So, it is not a matter of ethical concern.

Therefore, the correct option for this question is A.

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Answer:

Broadly speaking, different species are unable to interbreed and produce healthy, fertile offspring due to barriers called mechanisms of reproductive isolation. These barriers can be split into two categories based on when they act: prezygotic and postzygotic.

Explanation:

So the answer would most likely be C.

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Answer:

12: curly wings  

13: normal wings  

14: normal wings

for the last three the data would look like AA, Aa, aa

Also let me tell you this as a junior in high school this year of science is the easiest thing ever

Explanation:

Answer:

A tectonic plate (also called lithospheric plate) is a massive, irregularly shaped slab of solid rock, generally composed of both continental and oceanic lithosphere. Plate size can vary greatly, from a few hundred to thousands of kilometers across; the Pacific and Antarctic Plates are among the largest.

Answer:

creación de un potencial de acción (despolarización), redistribución de iones a través del soma y finalmente repolarización (estado de reposo)

Explanation:

Las neuronas son células nerviosas capaces de transmitir impulsos en forma de corriente eléctrica. Una neurona está compuesta por dendritas, el soma o cuerpo celular y el axón. Durante la transmisión del impulso nervioso, el estímulo es en primer lugar recibido por las dendritas, recorre el soma y termina en el axón. El impulso nervioso se transmite a través de la neurona mediante un proceso de despolarización. Primero, se produce un aumento de la carga eléctrica en el interior de la membrana neuronal debido al aumento de iones de sodio en el interior celular. A continuación, se produce la redistribución de iones dentro del soma, con lo cual la señal se va transmitiendo a lo largo de la neurona. Finalmente, cuando el impulso ha terminado de recorrer el axón, se produce la repolarización o estado de reposo, donde se produce el restablecimiento de las concentraciones iniciales de iones y la neurona vuelve a su estado inicial.

Answer:

A

Explanation:

Each enzyme operates best within a certain pH range.

Digestive enzymes are most active in an environment with a pH of 7 is the conclusions can be drawn from this graph.

Enzymes are referred to as proteins which act as biological catalysts. Catalysts enhance the chemical reactions. The molecules upon which enzymes may act are called substrates, and the enzyme converts the substrates into different molecules known as products.

Each enzyme works within quite a small pH range. There is a pH at which its activity is greatest (the optimal 7 pH) because changes in pH can make and break intra and intermolecular bonds, changing the shape of the enzyme and, therefore, its effectiveness.

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Answer:

Can confirm it is A

Explanation:

The process of the natural selection produce change occurs when there is the individual member of species.

It refer to the group of the organism where it should be reproduced in a natural way with one another and also developed the fertilization off-spring.

The organism that does reproduction at a se-xually only, the species population, and the animal species should not change the natural selection.

It is the process via which populations of living organisms should be adapt and change.

Therefore, the option A is correct.

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Answer:

the effects of sunlight on the aquatic life inhabiting the Amazon River. The center of all aquatic life in the Amazon is located in The Amazon Basin, the sun makes sure that all fish and plant life can sustain life.

The sunlight affects the aquatic species that lives in the Amazon River. The Amazon Basin is the epicenter of all aquatic life in the Amazon, where the sun ensures that all fish and plant life may survive.

The region of South America that the Amazon River and its tributaries drain is known as the Amazon basin. Approximately 6,300,000 km2, or 35.5 percent of South America, is covered by the Amazon river basin.

The Amazon basin not only contains the world's largest remaining tropical rainforest, it also harbours at least 10% of the known biodiversity, including endemic and threatened species of plants and animals, and its river contributes 15–16% of all river flow into the oceans.

The aquatic animals that inhabit the Amazon River are impacted by sunlight. All aquatic life in the Amazon is concentrated in the Amazon Basin, where the sun ensures the survival of all fish and plant life.

Thus, this is the chief effect of sunlight on the aquatic life inhabiting amazon river.

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Answer:

Ministry of climate change, Ministry of Commerce and Textile Industry, Ministry of Communications and Ministry of Defense

Explanation:

Ministry of climate change, Ministry of Commerce and Textile Industry, Ministry of Communications and Ministry of Defense are the four departments of national government. Every department has their own functions and responsibilities which is done by the officials of that departments. These departments has a great role in running of the government efficiently.

Answer:

Fitness or aptitude

Explanation:

Aptitude (or fitness) is the genotype/phenotype that results in the survival, fertility, and capability of having a mate. It is a way of measuring the individual ability to leave fertile offspring.

Aptitude puts together everything that matters in natural selection. Includes the survival capability, finding a mate partner possibility, producing fertile descendants, and leaving the genes to the next generation. The aptitude of a genotype must be significant for natural selection to act in its favor.

Answer:

A. high tide (A, C)

Explanation:

High tides on points A & C occur when the moon, the Earth, and the Sun are all lined up.

SUN -----<<<  EARTH >>> ---

                                          ----MOON

( as accurate as it can be in 2D)

As you can see, they are all in a straight line. The gravity of both the moon and the Sun are combined to output the greatest amount of gravitational force as possible; creating high tides on the 2 sides of the Earth. Points A & C represent these two sides and are therefore the answer.