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PtichkaEL [24]
3 years ago
10

How does your sympathetic nervous system use feedback to keep you

Biology
1 answer:
Nady [450]3 years ago
6 0

Answer: B. It speeds up your heart rate to help you deal with danger.

Explanation: When you feel you are in danger, your heart rate goes up to get you ready to run, you pump out more adrenaline, and you are more alert. Also, all the other answers are just wrong. In A you would pay more attention, C is the opposite, and in D you would not need to hear when your body is resting.

I hope this helps!

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Which type of microscope is the most widely used and shows cells against a bright background?
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Match the term to its description.
Amiraneli [1.4K]
I believe that the correct match will be;
Prominences- A
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Solar flares - C
Convection -D
Prominence is a large, bright feature extending outward from the Sun's surface. Prominences are anchored to the Sun's surface in the photosphere, and extend outwards into the Sun's hot outer atmosphere, called the corona.
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8 0
3 years ago
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Consider the evidence that explains how physical separation of two populations of a species can cause speciation. What effect do
Tom [10]

Answer:

  • Interruption in the genetic flow between separated groups
  • The emergence of new mutations in each of the groups, and their accumulation in time. Slow and gradual differentiation between populations.
  • Genetic divergence by natural selection and reproductive isolation
  • Prezigotic isolation mechanisms

Explanation:

Allopatric speciation consists of the geographic separation of a continuous genetic background that can give place to two or more new geographically isolated populations. These separations might be due to migration, extinction of geographically intermediate populations, or geological events. In this speciation, some barriers impede genetic interchange, or genetic flux, as the two new groups that are separated can not get together and mate anymore. These barriers might be geographical or ecological.

The process of allopatric speciation involves different steps that affect organisms:

  • The emergence of the barrier.
  • Interruption in the genetic interchange
  • The occurrence of new mutations and their accumulation in time in each population. Slow and gradual differentiation.
  • Genetic divergence by natural selection and reproductive isolation makes it impossible for the two groups to mate even if the barrier disappears.
  • Prezigotic isolation mechanisms will be favored by selection if occurs a secondary contact between the new species in formation.
4 0
2 years ago
Which statement would be used in an argument against the use of human embryonic stem cells for therapy?
Marizza181 [45]

The statement 'obtaining embryonic stem cells for use in therapy requires the destruction of embryos' would be used in an argument against the use of human embryonic stem cells for therapy. It is a type of stem cell therapy.

<h3>What are embryonic stem cells?</h3>

The embryonic stem cells are cells obtained from embryos that have the property to divide and specialize into different tissues.

The embryonic stem cells can be differentiated in the laboratory for the development of specific cell lineages.

The therapy using embryonic stem cells involves the use of these types of cells and the destruction of an embryo.

Learn more about embryonic stem cells here:

brainly.com/question/18243320

7 0
2 years ago
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