Final answer:
Proteins from animals are a good source of all 9 essential amino acids.
Step-by-step explanation:
Proteins from animals are considered to be a good source of all 9 essential amino acids. These amino acids cannot be synthesized by the body and must be obtained through the diet. Animal proteins, such as those found in meat, fish, dairy products, and eggs, provide all the essential amino acids in the right proportions for human needs.
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