Carbon Cycling in the Oceans Differs from Carbon Cycling on Land

Multiple Choice

Carbon cycling in the oceans differs from carbon cycling on land because in the oceans, carbon

A) comes directly from the water and never interacts with the atmosphere.
B) is not cycled through photosynthesis and respiration.
C) is used directly by organisms, and abiotic processes are less important.
D) must first diffuse into the water before it can be used by organisms.
E) cycles only through abiotic processes, bypassing living organisms.