What Is Life? 2nd Edition by Jay Phelan

Exercise 1

The two most important evolutionary innovations in vertebrates, which resulted in their eventual domination among the large animals, were:
A) air-breathing lungs and a more efficient heart.
B) opposable thumbs.
C) jaws and amniotic eggs.
D) the ability to walk or fly.
E) air-breathing lungs and endothermy.