3. Before entering the Krebs cycle, an intermediate molecule bonds to a 2-carbon molecule. This intermediate complex enters into the Krebs cycle, and combines with a 4-carbon molecule to form citric acid. The name of this molecule is
O citrase
coenzyme A
FADH
O ATP synthase

coenzyme A

Explanation:

Coenzyme A is essential. The body produces it and cannot function without it. It facilitates at least 100 chemical reactions in the body. Coenzyme A is considered to be an auxiliary molecule, a chemical that is necessary for the activation of certain enzymes and proteins or important chemical reactions.

Coenzyme A is a molecule - a helper that facilitates the oxidation process. This process leads to the formation of acetyl Coenzyme A - an important substance used for the production of manic acids in a living cell. Without this very important process, there would be no production of fatty acids that maintain the cell membrane.

a community that experiences major changes undergoes progress

allowed for the prediction of the properties of missing elements.