When the earth's continental crust and ocean crust formed, they were different densities. why did they differ in density and how did this affect their formation? a.) the continental crust was thicker and less dense. it rose above sea level, separating land from water. b.) the continental crust was thicker and more dense. it sunk below sea level, separating land from water. c.) the continental crust was thinner and less dense. it rose above sea level, separating land from water. d.) the continental crust was thinner and more dense. it sunk below sea level, separating land from water. i think it’s b, but i’m not completely sure. !

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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