Before two strands of a dna molecule can separate, the bonds between the must be broken.
a. phosphates
c. ribose molecules
b. base pairs
d. alleles

B. Base Pairs; the pairs are connected by bonds which must be broken in order for the two strands to separate 

Cell division is important to single celled organisms because it allows the cells to reproduce. through cell division, cells make exact copies of themselves. when single celled organisms go through cell division, they make exact copies of themselves which is how they reproduce.

It would be 232.4242