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Nitella [24]
3 years ago
7

Summarize why the fish heart and circulatory system are considered important evolutionary changes

Biology
1 answer:
malfutka [58]3 years ago
3 0
Fish has a singular circulatory system, means the blood carrying oxygen from pulmonary circuit will be dumped into the same chamber as the blood carrying wastes and CO2 in the heart, because the heart has only one chamber. 

amphibians has a 3 chamber heart, but still not a complete separated pulmonary circulation. However, it does have 2 loops at this stage. Of course birds and mammal also has this feature. So the distinction will be between fish and amphibian, which is the evolutionary double loop pathway. 
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Do you think one reproductive process promotes higher genetic variation than the other?
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2 years ago
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dem82 [27]
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4 0
3 years ago
Tom was in a coma after an automobile accident which killed his wife. His physical health improved and there is no medical reaso
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Answer:

If the inability of Tom to move his arms and legs has no apparent physical reason, it is likely that Tom may be suffering from conversion disorder.

Explanation:

Conversion disorders have a psychological basis, and they are dissociative disorders where there is a functional disturbance for no apparent reason. The term conversion means that a psychological problem can become a physical manifestation.

Tom is not able to move his arms and legs, but there is no medical reason why. Because of the trauma of losing his wife in an accident, it is possible that the cause of his paralysis is psychological, due to a conversion disorder secondary to a depressive disorder.

Learn more:

Difference between illness anxiety disorder and conversion disorder brainly.com/question/4413977

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