Answer:
<u>polymerase chain reaction</u>: A technique in molecular biology for creating multiple copies of DNA from a sample; used in genetic fingerprinting etc.
Explanation:
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Nowadays we have much more modernized farming. There are combines, tractors and other machines. Back then they used hundreds of workers and now 1 machine gets all that done in half the time. Try googling it for more info.
Your answer is B. hope this helps