What is falling action in a story?
O the end of the story, when all problems are solved
O a series of occurrences that unfold after the climax
O the introduction of the setting and the main characters
O a conflict in which characters face their opposition

The falling action is a series of occurrences that unfold after the climax.
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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.