Final answer:
Essential amino acids are vital nutrients that must be obtained from the diet since the body cannot produce them sufficiently. 9 essential amino acids are crucial for human health, and they play a key role in protein synthesis and overall biological functions.
Explanation:
Essential amino acids are amino acids that must be obtained through the diet because the body cannot synthesize them in sufficient amounts. In humans, there are nine essential amino acids that need to be acquired from food sources. Proteins are essential for life, and all organisms, including humans, require amino acids for various biological functions.
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