The Oceans Affect the Biosphere by

Multiple Choice

The oceans affect the biosphere by
I.producing a substantial amount of the biosphere's oxygen.
II.adding carbon dioxide to the atmosphere.
III.being the source of most of Earth's rainfall.
IV.regulating the pH of freshwater biomes and terrestrial groundwater.

A) only I and III
B) only II and IV
C) only I, II, and IV
D) only I, II, and III