This is the second stage of cellular respiration and takes place in the mitochondrial matrix. during this stage the decomposition of pyruvate to carbon dioxide is completed

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.

compost can be added to topsoil as a:

pesticide

the answer is d.) homologous; have mammary glands