WILL MAKE BRAINEST IF YOU ANsWER! EASY QUESTION*** HELP PLS ASAP! -
Carbon is essential to life on Earth. One reason it is so vital is that it is able to form bonds with many other elements and with itself. Inside living things, there are many compounds based on carbon, including fats, sugars, starches and oils. There are four main types of carbon compounds: carbohydrates, lipids, proteins and nucleic acids. Each of these has important roles in living organisms. Proteins make up muscles and carry messages, and carbohydrates give cells energy.

What is the meaning of the word "vital" in the passage?

A. necessary
B. small
C. energetic
D. useless

A. necessary

Explanation:

because that would be the best one

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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