What do you think? Should human activity be documented on the geological scale? Why or why not?
If the human population were not the size it was today, how would Earth be different?
Consider all four spheres-geosphere, atmosphere, hydrosphere, and biosphere-in your answer.

cell regulation is conducted by special proteins.

b.have there own function.

step 1: nitrogen fixation- conversion of atmospheric no₂ into forms useful to plants by lightning, bacteria, and cyanobacteria.

step 2: nitrification-process of converting ammonia to nitrite or nitrate.

step 3: assimilation-plant roots absorb new form of nitrogen.

step 4: ammonification-conversion of organic nitrogen to ammonia by bacteria involved in decomposition.

step 5: denitrification-bacteria turns the decomposed matter back into n₂o, which is released into atmosphere; repeat cycle.