The human body is composed of cells, organs, organ systems, and tissues. How are these organized? A)Groups of cells form tissues.
B)Groups of organs form tissues.
C)Groups of organ systems form tissues.
D)Groups of tissues form organ systems.
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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?