Select the correctly punctuated sentence.
ricardo screamed as he spilled, his frozen pineapple slushy
ricardo screamed as he spilled his frozen, pineapple slushy.
ricardo screamed as he spilled his frozen pineapple slushy.
ricardo screamed, as he spilled his frozen, pineapple slushy.

The third one:

Ricardo screamed as he spilled his frozen pineapple slushy.

It is unnatural to put the comma after a verb, so that rules out the first and fourth options.

A comma goes between two adjectives when they mean similar things. For example, big, fat dog is correct, but not big fat dog

Frozen, pineapple slushy.
Pineapple, frozen slushy.

The second one does not make sense, so you can't use a comma. That rules out the second option.

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.