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Step-by-step explanation:
The nitrogen bases form the double strand of DNA through weak hydrogen bonds. The nitrogen bases, however, have specific shapes and hydrogen bond properties so that guanine and cytosine only bond with each other, while adenine and thymine also bond exclusively.
Answer: adenine pairs with thymine, cytosine pairs with guanine
the nitrogenous bases are adenine, thymine, guanine and cytosine.the pairing occurs because the complementary bases form hydrogen bonds with each other.