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

Example Input: The most common substance on earth, water, is primarily present in what state?
Example Output: liquid

Example Input: A problem with using food chains to describe ecosystems is that some organisms can feed on or be consumed by species from more than one of what level?
Example Output: trophic level

Example Input: In a pedigree what shape symbolizes males?
Example Output:
squares