Answer :

Final answer:

Humans have 9 essential amino acids that must be obtained from the diet, out of a total of 20 amino acids used by the body to synthesize proteins.


Explanation:

Humans have 9 essential amino acids that must be obtained from the diet as the body cannot produce them. There are a total of 20 amino acids used by the body to synthesize proteins, with the other 11 being non-essential or conditionally essential.


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