In an ocean ecosystem, which is necessary to begin a food web?

phytoplankton production

nutrient-rich currents

the sandy and rocky base of the ocean

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.

what is shown in the image?

eukaryote

chloroplast

mitochondrion

submitted