The major storage in the phosphorus cycle is in ________.
A) the atmosphere
B) the hydrosphere
C) the lithosphere
D) rivers and freshwater lakes
E) our homes and offices
Question 2
Humans fix Nitrogen into the soil by ________.
A) applying fertilizer
B) clearing the land
C) planting large tracts of land with corn
D) applying calcium carbonate
E) using fossil fuels