If i could get a answer asap that would be awesome.
read the sentence.

although she was sad to leave her friends she knew she would see them again next summer.

which punctuation belongs in the blank?

a.
ellipsis
b.
comma
c.
hyphen
d.
dash

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.