Question

give reason for the following.1 arteries are thick walled.2 blood goes only one in one cycle through the heart in fishes.3
plant have low energy needs.

Answer 1

1)arteries are thick walled because they need to pump blood in very high pressure and for the that arteries are thick walled. 2)because fishes are only 2 chambered heart 3) because they are static at one place and they don't have to Move from one place to another