What is this? Please answer with an explanation

The answer is Tuna.

Explanation:

A Great White Shark eats tuna, seals and sea turtles as well as lots of other animals. Plankton is eaten by Blue Whales, shrimps and jellyfish as well as lots of other animals.

answer; /// i believe the correct answer is (reactants);

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.