Summarize where carbon is found on earth and how much of it is in the human body

Carbon is the basic building block to most cells in the body.

It helps with cellular respiration where your body releases energy stored in glucose and the glucose compound is full of carbon, hydrogen, and oxygen.

Carbon makes up 18% of the human body.

Sugars in the body like glucose hold carbon elements.

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

it is either c or d and i know for sure it is not a or b