Question

Regina conducted an investigation to determine whether earthworms add nutrients to soil. She used two pots of soil. She added three earthworms to the first pot. She did not add any earthworms to the second pot, which was the control. Regina tested the nutrient levels of the soil in both pots after two weeks.

What type of investigation is Regina conducting?

descriptive
comparative
experimental
procedural

Answer 1

Answer:

comparative..........

..