Aforensic scientist finds a single skin cell from saliva on a cigarette butt left in a room where a murder has just occurred. what process might he or she utilized to accumulate enough dna to determine who left the cigarette at the scene of the crime?
a. genetic engineering
b. gene therapy
c. gel electrophoresis
d. polymerase chain reaction

The best answer for this question would be: 

D. Polymerase chain reaction

It is used in molecular biology in order to create small fragments of the DNA. Those copies of the DNA mimic the happenings in the cell. This chain reaction is an efficient technique to further research on crimes.

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he movement of air through earth's or any planet's atmosphere is called wind, and the main cause of earth's winds is uneven heating by the sun. this uneven heating causes changes of atmospheric pressure, and winds blow from regions with high pressure to those with low pressure.

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