18. When are commas needed to set off an adjective clause? A. When the clause begins with "which.”
B. If the clause provides unnecessary description for the reader to understand the
sentence.
C. Both situations require a comma.
D. Neither situation requires a comma

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.

It's about a overweight ogre and another female ogre. there is also a donkey and cat in boots for some reason.