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professor190 [17]
3 years ago
11

Which of these statements best sums up evolution?

Biology
2 answers:
Bad White [126]3 years ago
8 0

<span>The statement that best sums up evolution is the change in a population through genetic variation over time. Natural selection may be through (1) differential reproduction, that is, not all organisms are able to reproduce to their fullest capacity because nature cannot simply sustain it and (2) acquire genes, that is heredity.</span>

Ksenya-84 [330]3 years ago
4 0

Evolution can be defined as the process of the change occurring in a population over a period of time through genetic variation. This genetic variation and the process of natural selection help a species to evolve by selecting the traits that helps it to better adapt to the environment. These genetic variations are inherited over time as the species continue to evolve.

Hence, the correct answer is 'change in population through genetic variation over time'.

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Explain how the following factors could affect crop yield.
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Answer:

Increase in temperature increases the amount of transpiration and the plants will lose lots of water by which it will die

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Based on the information in the graph, which blood type is most likely to be in shortest supply during an emergency?
Maksim231197 [3]
While there is no graph provided and I cannot find the graph online, I will base my answer through theory. 

In theory, the most common blood type is O+, followed by A+, then B+, then AB+. Rh negative blood is deemed to be rare. While the most common blood type is O+, the same blood type is also called the "universal donor" as a type O+ blood has no antigens attached in red blood cells therefore the probability of adverse reactions (i.e. hemolytic reactions) when transfused to other blood types are close to nil. In an emergency situation, wherein there is not enough time to do proper crossmatching, blood type O+ can be used therefore supplies of blood type O+ are easily depleted.
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We have talked about the central and peripheral nervous systems. We know that the peripheral nervous system relays signals to an
JulsSmile [24]

Answer:

  1. The peripheral nervous system has - Somatic nervous system and Autonomic nervous system.
  2. These systems control our body action by this controls all the types of muscles.

Explanation:

  • Somatic nervous system have -  Cranial nerves and  Spinal nerves
  • Autonomic nervous system have -   Sympathetic and  Parasympathetic  system.
  • The somatic nervous system controls our voluntary and involuntary actions by cranial and spinal nerves and controls all three types of muscles such as cardiac, smooth and skeletal.
  • The autonomic nervous system controls the involuntary actions of our internal organs.
  • The sympathetic and parasympathetic system relates to all types of muscle.
  • The sympathetic and parasympathetic system accelerates and decelerates the heart beat respectively, by this controls the cardiac muscle.
  • The sympathetic and parasympathetic system stimulates and relaxes our internal organs respectively, by this controls the smooth muscles.
  • The sympathetic and parasympathetic system prepares our body as a whole for a action and also relaxes our whole body respectively, by this controls the skeletal muscles.

5 0
3 years ago
From which of the following does the right atrium receive blood?
olga2289 [7]

The right atrium receives blood returning from others parts of the body through the superior vena cava and the inferior vena cava.  

Explanation:

The pathway of circulation begins in the right atrium which receives the carbon dioxide-rich deoxygenated blood returning through the systemic circulation.  

The deoxygenated blood from regions superior to the heart, i.e., the head, neck, shoulder areas are collected through the superior vena cava and that from the parts inferior or lower to the heart like visceral organs, extremities, trunk, hip etc are brought through the inferior vena cava.

Both these venous systems (superior and inferior) fill the right atrium.

The right atrium then pumps the deoxygenated blood to the right ventricle via the tricuspid valve.

The right atrium is filled with blood during diastole.

3 0
4 years ago
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