What are mutations?

a. changes in nucleotides of a dna molecule that affects the genetic message

b. repairs of damage to dna molecules by specialized enzymes

c. removal of damaged dna nucleotides by enzyme molecules

d. reduction in the rate of replication of dna due to regulatory mechanisms.

c.) polymerase chain reaction

- "unlike the original dna fingerprinting method, dna profiling does not use restriction enzymes to cut the dna. instead it uses the polymerase chain reaction (pcr)? to produce many copies of specific str sequences. pcr is an automated procedure that generates lots of copies of a specific sequence of dna."

meteorologists would compare a new weather map with one 24 h old to see how fast a front is moving.

the question isn't complete here so i can't right an answer '_'