How many times does a hummingbird flap its wings in a second

What an amazing statistic. The answer is about 70 times a second which is roughtly 4200 a minute.

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."