Of the 200 to 400 million sperm cells released in a typical ejaculation, approximately how many do you think will reach the ovum?

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.

the animal that would be cutest if scaled down to the size of a cat? elephant