Which is a key component of the energy molecule atp?

The correct answer is phosphorous but occurs in the form of a phosphate. ATP stands for Adenosine Triphosphate. 

ATP is composed of three components.  At the center of the molecule is found ribose, a sugar molecule which is the very same sugar that forms part of RNA. To one side of ribose is attached a base known as adenine. This base belongs to a group of molecules made of linked rings of both carbon and nitrogen atoms.

To the other side of ribose is attached a string of phosphate groups which are key to the energy carrying activities of ATP.

This answer is not mine, this answer is TaskMasters! Thank you :D

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