O LEVEL 1 04
What effect does biodiversity have on a
community?
A. It enables species to survive in a desert
B. It enables the community to withstand
changes
C. It makes destruction by insects impossible
D. It makes primary succession more likely

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?