Question

how are descriptive investigations used by scientists? all of these are correct. biologists use them to test how one variable specifically affects another. biologists use them to compare living things. they provide a strong foundation for further research and experimentation.

Explanation:

Descriptive investigations in biology can be used to compare living - things. They also provide a base for further research. Testing how one variable affects another is more of an experimental investigation, but the other two correct uses make the "all of these are correct" option valid.

Answer:

A. All of these are correct.