Answer:
Essential amino acids.
Step-by-step explanation:
Amino acids are the polymers of the protein. Amino acids contain the amino group, carboxylic group, hydrogen and the different R group. These amino acids are important for the body metabolism.
There are total twenty amino acids present in the body. Ten amino acids are referred as essential amino acids as they are not present in our body. They are the important or essential for the body and must be obtained from the diet and the external source.
Thus, the answer is essential amino acids.