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

explanation:

b,bacteria convert nitrates

into nitrogen gas.

d,plants and animals take in

and use nitrogen compounds.

e,bacteria break down waste    

products and return nitrogen  

to the soil.

a,bacteria convert atmospheric

nitrogen to ammonia.

c,bacteria convert ammonia

to nitrites and nitrates.

i'm thinking (a) to keep sand in place; ////////////

explanation: a sand fence or sandbreak, like a snow fence, is used to force windblown, drifting sand to accumulate in a desired place. sand fences are employed to control erosion, sand dune stabilization, keep sand off roadways, and to recruit new material in desert areas.