During the germinal period of prenatal development, some cells become part of the brain, some become part of the leg, and some become part of the stomach, etc. the term for this process is: select one: a. duplication. b. division. c. differentiation. d. specialization.

Amino acids contain the elements carbon, hydrogen, oxygen, nitrogen, and sometimes sulfur. of the 20 amino acids found in humans, 11 are called "nonessential" because they can be manufactured by the body when needed. which elements in these 11 amino acids are commonly obtained from the metabolism of sugar molecules?