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

Ex Input:
Photoautotrophs and chemoautotrophs are two basic types of what?

Ex Output:
autotrophs

Ex Input:
Orbiting at a fairly typical 370 kilometers, the international space station is an example of what?

Ex Output:
manmade satellite

Ex Input:
What is oceanography the study of?

Ex Output:
oceans