Answer:
What Keene High school students are you reading about? And what scientist are you talking about? If you had given more information I would have helped. Anyways, just look at what it says in the book that the scientist did, and what the Keene high school students did. And see what they both have in common.
Are you from USA or not or India
Answer: D. Heat
Explanation : Water Vapor is a source of warmth, since the heat that is radiated from Earth is absorbed by the water vapor. This is why greenhouses use water vapor as well.