What is kerbs cycle and where it occur?

Explanation:

The Krebs cycle is a series of chemical reactions used by all aerobic organisms to generate energy through the oxidization of acetate—derived from carbohydrates, fats, and proteins —into carbon dioxide.

OR,

It is a biochemical process by which nutrients are broken down to release energy, which gets stored in the form of ATP and waste products are released.

The Krebs cycle occurs only within the mitochondrial matrix.

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the answer is "a.) well–developed vascular system."

explanation:

i think it’s c but i might be wrong. if i am let me know! have a good rest of your day as well!