Dna replication
a. begins when two dna molecules join together to exchange segments
b. occurs in the endoplasmic reticulum results in the formation of four new dna strands
c. occurs through the addition of nucleotides to the end of the parental dna molecule
d. uses each strand of a dna molecule as a template for the creation of a new strand

The correct answer will be option D.

Explanation:

DNA replication is a complex process which forms the exact copy of the DNA molecule from the existing DNA.  This process takes place during the synthesis phase or S-phase of the cell cycle which takes place in the cytosol of prokaryotes and nucleus of the eukaryotes.

The most common way of producing replicas of the DNA molecule is through semi-conservative mode in which each strand of DNA is synthesized from both the strands of the parental DNA using as a template.

Thus, option D is the correct answer.

a- multicellular

b-eukaryotic

c-no cell wall

d-heterotrophic

e-autotrophic