What is meant by the term base pairing? How is bese pearing involved in DNA

Base pairing is the principle that hydrogen bonds form only between certain base pairs—A and T, and C and G. In DNA replication, base pairing ensures that the complementary strands produced are identical to the original strands.

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the "dirty dozen" chemicals banned in an international treaty are formally known as persistent organic pollutants, or pops. the united nations environment program provided this background on what they are and what they can do to humans and wildlife.

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