Organisms that live in marine biomes must be adapted to the salt in the water.
Marine biology is the study of organisms that happen to be marine.
Marine biology studies creatures that live in water biomes.
What is the study of creatures that live in water biomes?

A: animals
B: warm-blooded
C: marine biology
D: it needs them
E: Animal survival
F: observation
G: alchemy
H: animal reproduction