What does the red-shift of galaxies indicate? a. the galaxies are not moving. b. the galaxies are shrinking. c. the galaxies are moving toward each other. d. the galaxies are moving away from each other.

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?