Charles places 30 pictures on his bulletin board in 6 equal rows. how many pictures are in each row?

30 pictures divided by 6rows =
30:6=5
Each row 5 pictures

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.