Charles darwin's principle of an evolutionary process in which organisms that are best adapted to their environment with survive and produce offspring is called: behaviorism natural selection cultural psychology cognitive psychology

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.

a- all cells come from pre-existing cells

layer 3 is younger than layer 6.