Aresearcher observing an ecosystem describes the amount of sunlight, precipitation and type of soil present. which factors is the researcher most likely describing?
biotic factors in a forest.
biotic factors in a tundra.
abiotic factors in a prairie.
abiotic factors in a coral reef.

A researcher observing an ecosystem describes the amount of sunlight, precipitation, and type of soil present. The researcher is most likely describing abiotic factors in a prairie. 
A and B are incorrect because the factors described are abiotic, not biotic.
Di is incorrect because abiotic factors listed include soil, which is not likely to be described in an ocean environment. 

Interacting group of various species in a common location. for example, a forest of trees and undergrowth plants, inhabited by animals and rooted in soil containing bacteria and fungi, constitutes a biological community.