Why does an author use characterization in a story?

An author shows what a character is like by portraying his or her actions, speech, or thoughts. a good use of characterization always leads the readers or audience to relate better to the events taking place in the story 

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It tells the audience what the charcter/characters are like.

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Ithink it’s c or a

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.