A scientific law describes a behavior of something that occurs
Answer:
Peptide bonds and Amino Acids
Explanation:
Primary structure. The primary structure of a protein refers to the sequence of amino acids in the polypeptide chain. The primary structure is held together by peptide bonds that are made during the process of protein biosynthesis.
Answer:
a closed circulatory system.
Explanation:
an earthworm circulates blood exclusively through vessels.
