Can someone please answer 1-8, please?

Explanation:

when we exercise our heart beats faster the blood can quickly go to the lungs and the lungs gives oxygen to the blood the blood Carries oxygen back to the heart very quickly this is why 8 question

this transfer is call conjunction

the cladogram shown here shows similarities and differences among several classes of vertebrates. anatomically, the four have limb structure as their common ancestor. we might separate the mammals from the other three classes because they a) divergent; do not lay eggs b) identical; are warm-blooded c) varied; a four chambered heart d) homologous; have mammary glands