Dinobryon is a species of protozoa that reproduce asexually. How can this
asexual reproduction be harmful to the species?

Asexual reproduction is speedy, but it doesn’t provide for genetic variation. When a cell reproduces asexually, it makes an exact copy of itself. This doesn’t allow for much selective alleles because all alleles are the same, and it doesn’t allow for too much evolution because of this selfsame reason. No phenotypes are more or less fit because they’re all the same.

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.

is this a psat question, if so do not cheat try your best.