Answer:
Ethan's classmates frown when he speaks rudely in class. This is positive because his friends are giving him a sign that he shouldn't be doing that without being rude.
Explanation:
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DNA (or deoxyribonucleic acid) is the molecule that carries the genetic information in all cellular forms of life and some viruses. It belongs to a class of molecules called the nucleic acids, which are polynucleotides - that is, long chains of nucleotides.