Answer:
Discovered that DNA was in the shape of a double helix
The best and most correct answer among the choices provided by the question is the third choice "jellyfish and corals"
<span>Cnidaria is a phylum containing over 10,000 species of animals found exclusively in aquatic environments: they are predominantly marine species. Their distinguishing feature is cnidocytes, specialized cells that they use mainly for capturing prey.</span>
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I only have one reason but hope it helps!
Because without those bases pairing there <span>would be no structure of a DNA.</span>
Capillaries: <span>any of the fine branching blood vessels that form a network between the arterioles and venules.</span>
