Which vertebrate group has most advanced respiratory structures?

fish, amphibians, reptiles, birds, or mammals?

I’m doing some practice exam questions for biology, and i’m not sure how to do these 3 parts to the question.

Vessels draining the myocardium of the heart, open primarily ,into which chamber?

The greenhouse effect a. something that has occurred for millions of years b. an unnatural phenomenon caused by humans that maintains earths temperature range. c. the results of the differences in the angle of the suns rays d. an unnatural phenomenon that causes heat energy to be radiated back into the atmosphere