Dr. Schmidlap wants to study whether homework actually helps her students learn. But she doesn’t know the best way to study the issue. Given the three research methods below, explain how Dr. Schmidlap might study her question.

How do earth’s systems interact with each other?

The sun a. will become a red giant within two to three million years b. is in its main sequence, which willlast thousands of years c. is in its main sequence, which will last billions of years. d. will explode as a supernova after its main sequence

Which of the following is a type of technology that can be used at a coal-burning power plant to remove both particulate matter and gases? bag filter catalytic converter cyclone electrostatic precipitator scrubber