a small number of finches live in a protected bird sanctuary natural selection is like least likely to occur in this population

Natural selection is least likely to occur because the birds are living in a protected sanctuary.

Explanation:

A protected sanctuary is important for protected species or "small numbered finches. Protected sanctuaries are made so that almost extinct species can start to repopulate without the effect of any natural selection.  

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."