Name three ways the environment in the ocean is different than life on land.

Explanation:

Marine organisms produce over half of the oxygen that land animals currently need to breathe. ... Most sea animals extract oxygen directly from ocean water, while land animals breathe air from Earth's atmosphere, which consists of about 21 percent pure oxygen

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.