The microscopic organisms at the base of the marine food chain are known as
a. primitive life.
b. plant life.
c. terrestrial animals.
d. phytoplankton.

The microscopic organisms at the base of the marine food chain are known as: phytoplankton.

try using substitution:

x + y - 6 = x - y. (i'm not giving you the exact answer). since 0 = x - y, then sub 0 in the equation with x - y. combine your like terms, and then use inverse operations, and you'll have your answer.

: -)

affects the water bodies: excessive use of fertilizers causes eutrophication. the fertilizers which are used on plants affect the quality of land on which it is used, further causing erosion of soil. the fertilizers used on plants contain harmful chemical fumes which affect the environment.