Respuesta :

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adenine (A) always bonds with the pyrimidine thymine (T)
cytosine (C) always pairs with the purine guanine (G)
DNA: Adenine (A) pairs with Thymine (T), Cytosine (C) pairs with Guanine (G).
RNA: Adenine (A) pairs with Uracil (U), Cytosine (C) pairs with Guanine (G). 

Hope this helps!
good job