The citric acid cycle is a cycle because the starting molecule, , is regenerated at the end.

Oxaloacetate

Oxaloacetate

Explanation:

At the end of this series of reactions, the four-carbon starting molecule, oxaloacetate, is regenerated, allowing the cycle to begin again. In the first step of the cycle, acetyl CoAstart text, C, o, A, end text combines with a four-carbon acceptor molecule, oxaloacetate, to form a six-carbon molecule called citrate.

i have know clue i guess aluminum

i think lol

the answer is b & c i believe : )