Which pair of statements best describes an essential amino acid? OItis an amino acid that contains peptide bonds. An example is proline.
O Itis an amino acid that contains nitrogen. An example is aspartic acid.
• Itis an amino acid that cannot be made by the body. It must be obtained from eating certain foods.
O It is an amino acid that can be produgna by the body. Vitamin supplements maintain healthy levels.

Hi there, your answer to this is: It is an amino acid that cannot be made by the body. It must be obtained from eating certain foods.

Explanation:

There are 9 essential amino acids that we need in our bodies which are:  histidine, isoleucine, leucine, lysine, methionine, phenylalanine, threonine, tryptophan, and valine which can be found in foods that we normally eat.

Hope this helped :)

preservation because he preserves part of the land and preserves means save

explanation:

straight or amphibians are homeothermic to thermal