Am thinking of 3-digit number less than 300. The tens digit is less than the hundreds digit and the ones digit is less than the the tens digit. Which number am I ​

-321

Explanation:

or something like that

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."