Question

drag the missing word into place
the scientists studied the of the soil to determine
how much fertilizer was in it.
element
composition
solvent

Explanation:

The word "composition" means the combination of elements or parts that make up something. In the context of soil, studying its composition would involve analyzing what it is made of, including the amount of fertilizer. "Element" refers to a pure substance that cannot be broken down further, which is too narrow for this context. "Solvent" is a substance that dissolves another, which is not relevant here.

Answer:

composition