An author might use the framed narrative technique to
a. develop his or her narrator as a character
b. offer insight as to his or her opinions about the story
c. make the story more appealing to an educated audience
d. communicate the story in a reliable narrative voice

Its used to provide the reader with context about the main narrative but I'm not sure what the answer to this would be? Maybe b?

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.