As an adult your DNA replicates billions of times and undergoes cell division. In the face of extreme challenge, DNA polmerase does a remarkably good job of inserting proper nucleotide at each spot in response to template. Though, mistakes occasionally occur.

a. what is one way in which a mutation can occur duing dna replication.
b. what is one way in which a mutation can be initiated in DNA that is not replicating.
c. explain how in a. (from above) the type of mutation would be repaired.
d. is every unrepaired mutation harmful? Why or why not?