Which of the following is most important to the heartbeat?
a. aortic valve
b. sinoatrial node
c. lymph node
d. tricuspid valve

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."

well, you see. the answer to your question is quite simple. the thing that is big, powerful, and over 9,000 is your mom.