During replication the strands of a double stranded dna molecule separate when the bonds are broken between their paired bases. explain why, in terms of the genetic code, is it important that the molecule separate between the bases

DNA undergoes semi conservative DNA replication in which a new Daughter strand is evolved from each parent DNA strand. Hence it is important that the parent DNA strand separate such that bases on the Daughter DNA can be complimentary to that of the parent strand it is coded from and same as that of the antiparallel parent DNA which is being separated. This ensures conservation and protection of the integrity of the genetic code

Iwould say overuse ( but not 100% sure ) in the u.s. we tend to overuse water by leaving it running, throwing it away, taking long showers, etc.

You should never redesign your experiment. try and see what in your experiment you made a mistake on or try and test your experimemt with somebody else. see if they get the right results.