Nitrogen fixation is a natural process by which inert or unreactive forms of nitrogen are transformed into usable nitrogen. why is this process important to life

Because through them plants are able to supply their nitrogen needs and provide this element to humans and other animals whose nitrogen is essential.

Explanation:

Biological nitrogen fixation (BNF) is considered, after photosynthesis, the most important biological process on the planet. It is based on the fact that some microorganisms, known as diazotrophic, are able to break the bond that joins the two atoms of atmospheric nitrogen (N2) into ammonia (NH3), which is assimilable by plants. If the association between these microorganisms and plants is efficient, the fixed N can supply the needs of the plant, eliminating the use of nitrogen fertilizers and thus offering economic and ecological advantages. In addition, through food, plants provide nitrogen to humans and other animals.

you are certainly talking about this picture:

a: is the label of the white square, it is showing the  replication fork, formed by helicase (d) ==> so it is the site of dna separation and replication 

b: is a new dna brand that is following directly the replication fork, so it is continuous ==> built continuously from 5' to 3

c: dna polymerase cannot replicate dna on its own, it needs the of their proteins, and one of them plays the role of a clamp which fixes  the dna with the dna template and increases  the processivity of the enzyme. ==>   stops polymerase from falling off the  template.

d: is the enzyme responsible for forming the replication fork (helicase) ==> unwinds and separates dna into two strands

e: is the delayed strand, it is built  in the opposite sense of the helicase, so dna will be built in fragments ==> built  fragments from 5' to 3 joins

and finally f: is the enzyme that builds  the new dna strand (dna polymerase) ==>   adds nucleotides to make a new dna helix.

credit: gradman555p98x9p

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hope this you! : )

(i popped my answer into google translate so it may be a bit wonky)