The idea of molecular clock genes has been studied for decades, but the hypothesis remains a controversial topic in evolutionary biology. why do you think that is the case? what are three questions you still have about the use of molecular clocks?

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 answer is 1. photosynthesis. glad to

silt loam

hope this

. ph changes the ability of them he enzyme to dissolve in water.