A normal, full-term pregnancy can range from
37-42 weeks. It's divided into three
trimesters. Each trimester lasts between 12
and 14 weeks, or about three months.
Specific changes occur to the fetus during
each of these trimesters.
Which of the following events occurs during
the 3rd Trimester?

A. Fingers and toes form.
B. The lungs fully develop.
C. A heartbeat can be heard with a stethoscope.
D. The cardiovascular system develops.

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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c.more precipitation,but only when emission levels.