What claim is this writer making in the essay's introduction? a. Students often notice when their peers are cheating.
b. Students are willing to look the other way when they see peers cheating.
c. Students should report cheaters so the practice can be stopped.
d. Students are aware that cheating is wrong but are willing to risk it.

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.