There are 20 different amino acids. what makes one amino acid different from another?

Amino acids specialize in their aspect of production, for instance one type of Amino Acid could code for a specific trait and another codes for another trait and so on. So, Amino Acids specialize in establishing in coding for one part of a gene.

the answer is z.

the human body has five levels of organization. level 1: cells. cells are the basic units of life and form the first level of organization. cells in the human body have specific functions. examples include nerve cells, blood cells, liver cells, and so on.