Is there gonna be a end to earth?

there should be at some point we will never know

Explanation:

No One knows When the Earth is going to end.

Explanation:

Have a blessed day!

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."

your answer is "the 1950's"