Answer:
F) mandated.
Explanation:
Mandated by meaning is to, quote "issue an authoritative command". In this case, the authoritative command is the "law". The law is mandated and enforces the conservation of energy.
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1.), missing links
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DNA isolation is a process of purification of DNA from sample using a combination of physical and chemical method while on the other hand, Polymerase chain reaction (PCR<span>) is a technique used in molecular biology to amplify a single copy or a few copies of a piece of DNA across several orders of magnitude, generating thousands to millions of copies of a particular DNA sequence.</span>