Answer:
If I am not wrong it should be B and D not entirely sure
Answer:
DNA has four nucleobases: adenine, thymine, guanine, and cytosine. The nucleobases in a DNA strand have preferred partners to form hydrogen bonds with. Cytosine pairs with guanine, and adenine pairs with thymine. These are the base pairing rules that allow DNA replication and protein synthesis to happen.
Explanation:
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The branch of biology that deals with the relations of organisms to one another and to their physical surroundings.