Which biomolecule is primarily responsible for providing you with energy?

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

b.have there own function.

the answer is c. it will give up it's valence electron to the other atom.