Carbon is fixed in the biosphere through ________ into carbohydrate compounds.
A) bacteria
B) biomes
C) photosynthesis
D) dentrification
E) transit
Question 2
Of the biogeochemical cycles, which have been interfered with by the actions of humans, which is thought to be likely to have the most far-reaching effects on the biosphere?
A) Oxygen
B) Nitrogen
C) Carbon
D) Water
E) Copper