Question

What are some of the major anatomical changes that needed to occur to facilitate the transition...

What are some of the major anatomical changes that needed to occur to facilitate the transition from single to double circulation?

Homework Answers

Answer #1
  • single circulation

occurs in fishes.

The blood travels only once through heart in one complete cycle.

  • Double circulation

​​​​​​​occurs in mammals.

Blood travels twice through the heart on complete cycle.

  • ​​​​​​​
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