Cytosine pairs with Guanine
Adenine and Thymine are pairs also
Hope this helps :)
Write pangea in google images and search (: I cant draw if for you, but if i could, i would!
Answer:
because the items in a meal are all different and digest differently
Do not worry so much about the why of classification. Classification is important because it is a lens through which to see what is there. It is not intrinsically true in and of itself. Distinctions are important only as vehicles for a common base of communication. All things have symmetry. A reflection has symmetry. Symmetry means organized life. Organized life is what happens when RNA replicates. It is the difference between chaos and order