People who lose weight rapidly are more likely to regain the weight, leading to repeated cycles of weight loss and gain.

So what is the question because I do not understand this at all.

Explanation:

the answer would be d

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.