What is the closest star to our solar system

Alpha Centauri

Explanation:

The Alpha Centauri system is the closest star system to the sun—The Alpha Centauri system is 4.36 light years away from earth and our sun, which is a very long distance, but still short enough that it is the current third-brightest star/star system visible from Earth. (In our sky's dome—we see this multiple system as a singular star)

b

explanation:

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."