Amino acids and sugars are both required by animals to maintain their health. Without a diet containing both of these, animals cannot survive. Amino acids are obtained by animals when they digest .
A) nucleic acids
B) carbohydrates
C) proteins
D) lipids

c

Explanation:

Amino acids are the monomers of protein molecule.Each amino acid molecule is made up of an amine group,caboxylic acid  group,Hydrogen atom and R-group. All are attached to the alpha  carbon.It is the R-side group that differentiate one amino group from another.

These amino acids units are joined together by the peptide bonds to form the giant protein molecules

The arrangement, the number of the amino acids and the orientation of these  amino acids  can be used to classify protein into different primary,secondary, tertiary and Quaternary levels.

Generally protein digestion begins and ends in the stomach and the small intestine. by enzymes pepesin and renin, and the activities of enzymes of the pancreas  chymotrypsin and trypsin,respectively.

The cells in the wall of the small intestine finally breakdown the digesting protein into amino acids by the activities of the enzymes there.