Given a scientific question and its correct answer, generate supporting facts for the answer. This supporting fact can be an explanation for the answer to the given question.

Input: Consider Input: Question: Water, carbon dioxide, and what other element are important agents of chemical weathering? Answer: oxygen

Output: Water, carbon dioxide, and oxygen are important agents of chemical weathering.

Input: Consider Input: Question: What is defined as a group of living and nonliving things and their environment? Answer: ecosystem

Output: An ecosystem is a group of living things and their environment. It is made up of both living and nonliving things.

Input: Consider Input: Question: Which state of matter has the lowest density? Answer: gases
Output: Gases have much lower densities than liquids and solids. For example, liquid water is over 1000 times more dense than water vapor at STP.