Answer:
Carboxyl group and amino group.
Explanation:
Amino acids have three parts which are the carboxyl group, amino group and the side chain. When forming a peptide bond, the carboxyl group of one amino acid forms bonds with the amino group of the other one to form the peptide bonds between them.
I hope this answer helps.
A. the runner's muscles have accumulated lactic acid.. I think. 99% sure
Plant cells have always used the suns energy for food through photosynthesis, so 3 is false