Given a scientific question, generate a correct answer to it.

Example Input: Where are free-living roundworms mainly found?
Example Output: freshwater habitats

Example Input: What living things are considered photoautotrophs because they use sunlight and carbon from carbon dioxide to synthesize chemical energy in the form of carbohydrates?
Example Output: plants

Example Input: An aqueous solution is a homogeneous mixture in which the most abundant component is what?
Example Output:
water