I need help labeling

Fun Fact:

Explanation:

An apple, potato, and onion all taste the same if you eat them with your nose plugged

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."

the correct answer to this question is #5