Proteins are macronutrients required for the function and regulation of all cells in the body. ( a. beans, b. lentils, c. quinoa) , an example of a complete plant protein that provides the necessary ratios of all the (a. complex sugars, b. essential fatty acids, c. essential amino acids ) to the body.

Here is the full sentence:
Proteins are in the body. QUINOA, an example of a complete plant protein that provides the necessary ratios of the ESSENTIAL AMINO ACIDS to the body.

There are a total of 20 amino acids in nature;they are the building block of proteins. These amino acids are divided into two different classes; essential and non essential amino acids. We do not need to take the non essential amino acids in our food because our body can synthesize them when they are needed. We have to take the essential amino acids in our food because our body can not synthesize them. A protein source that contains all the essential amino acids is called a complete protein and a good example is quinoa. An incomplete protein source is one that does not consist of all the essential amino acids.