Complete protein sources provide adequate amounts of all the amino acids not manufactured in the body. Option a is correct.
Proteins are made up of amino acids, and there are nine essential amino acids that the body cannot synthesize and must obtain from the diet. Protein sources that provide adequate amounts of all the essential amino acids are called complete proteins. Animal-based protein sources, such as meat, poultry, fish, eggs, and dairy, are generally complete proteins.
Plant-based protein sources, such as legumes, nuts, seeds, and grains, are often incomplete proteins because they are deficient in one or more of the essential amino acids. However, vegetarians and vegans can still obtain all the essential amino acids by combining different plant-based protein sources to create a complete protein. Hence option a is correct choice.
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--The complete question is, which of the following describes protein sources that provide adequate amounts of all the amino acids not manufactured in the body
a. complete
b. Incomplete--