Answer:
Two characteristics are a notochord, and a dorsal hollow nerve cord.
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Nucleic acid<span> typically contain phosphorous, and nitrogen plays an important structural role in nucleic acids and proteins. The proteins, being made up a diverse set of amino acids, have, in addition to carbon, hydrogen, oxygen, and nitrogen, the elements sulfur and selenium.</span>
Answer:
what is the question you basicly just gave us a paragraph to comment on
Explanation:
