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what is meant by kerbs cycle

The citric acid cycle – also known as the TCA cycle or the Krebs cycle – is a series of chemical reactions used by all aerobic organisms to release stored energy through the oxidation of acetyl-CoA derived from carbohydrates, fats, and proteins. 

Explanation:

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the sequence of reactions by which most living cells generate energy during the process of aerobic respiration.

answer; i believe its (ovulation);

they fuse to form they have half as many chromosomes as a somatic cell of the same individual. b