Which best describes the reaction A+B+C+energy ABC

Endothermic reaction

Explanation:

An endothermic reaction is a reaction in which reactant molecules require the input of energy before they proceed to products.

Hence, the reaction A+B+C+energy --> ABC is an endothermic reaction since it had the supply of energy before it could yield the product ABC

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.