Acharacteristic that has more than one pair of possible traits is said to be a(n)

A characteristic that has more than one pair of possible traits is said to be a(n) epistasis

Explanation:

An epistatic characteristic is also called a polygenic trait. Polygenic traits are controlled by multiple genes that may be located near each other or even on separate chromosomes. The traits are however not inherited in the mendelian way.

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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.