Explain where the drinking water you consume may have been stored before it reached your house

u

Explanation:

a the clouds then a lake or in the ground then cleaned then in bottles then in ur body  

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."