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

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 type of lines run next to each other?

Ex Output:
contour lines

Ex Input:
What subphylum, which includes crabs and crayfish, represents the dominant aquatic arthropods?

Ex Output:
crustaceans