Which of the following sentences shows an adverb modifying an adjective? A. The pancakes at this diner are simply the best!
B. He very happily accepted the position.
C. We hold this party annually.
D. She softly whispered her secret so no one could hear.

Okay, biology isn't exactly my strongest subject (it never has been), but i'm pretty sure the answer is nucleotides. dna is made up of nucleotides. each nucleotide contains a phosphate group, a sugar group, and a nitrogen base. there are four different nitrogen bases: adenine (a), thymine (t), guanine (g), and cytosine (c). a always pairs with t, and g always pairs with c.