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1) Hydrogen bonds between nucleotide break

[the enzyme helicase breaks the hydrogen bonds between the 2 adjacent DNA strands first]

2) Strands of DNA separate

[This exposes the template strand used for the synthesis of a new DNA strand]

3) Free nucleotide are attracted to exposed bases on the loose strands of dna

[Free deoxyribonucleotises are recruited to complentary base pair on template strand from 5'to 3'direction by DNA polymerase which reads the template strand from 3'to 5' direction]

4) hydrogen bonds between nucleotide form.

[After new strand of DNA is synthesized, both template strand and new strand annuals by forming hydrogen bonds between each complimentary base pairs, marking the end of DNA replication. ]

12A).emzymes which is one of the biological catalysts

12B).The enzyme, DNA helicase, unwinds or unzips the two strands of DNA so that both may be replicated.

13.The "Complementary base pair rule" is used to join the free nucleotides to the exposed bases of the DNA.

14. Because each helix that is created contains one strand from the helix it was copied from.

14.(my own take on it): It is called semi because it is made up of half of one helix, and half of another. It is also called conservative as it conserves the strand copied.  

Explanation:

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"a.) well–developed vascular system."