Often only small amounts of dna are found at a crime scene. which technique uses an enzyme to replicate dna regions from a small sample of dna for use in dna fingerprinting?
vntrs (variable tandem repeats)
pcr (polymerase chain reaction) analysis
strs (short tandem repeats)
mtdna (mitochondrial dna) analysis

Only small amounts of DNA are found at a crime scene. The technique that uses an enzyme to replicate DNA regions from a small sample of DNA for use in DNA fingerprinting is PCR (polymerase chain reaction)

PCR is used as a tool in genetic fingerprinting. This technology can identify a single person from among a million others. Once a tiny DNA sample from a crime scene has been amplified onto numerous copies by PCR, the DNA can be compared with a DNA database or with DNA from suspects to identify or rule out suspects during a police investigation. 

answer: 21

step-by-step explanation:

divide 630 by 30. 30 goes into 630 21 times