The area of a lake or pond where no sunlight reaches is the a. savanna
c. open-water zone
b. estuary
d. deep-water zone

d. deep-water zone

Explanation:

hope this helps

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.