Look at the food web shown above. In this ecosystem, phytoplankton are considered to be
OA. producers
OB. decomposers
OC. consumers
OD. all of these

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?