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

Example Input: Radon is inert and generally unreactive because it is which kind of gas?
Example Output: noble gas

Example Input: What two types of communication do both humans and birds use primarily?
Example Output: visual and auditory

Example Input: What happens to most of the energy in a trophic level as it passes to the next higher level?
Example Output:
it is lost