Science writer Carl Zimmer is embarking on a series of articles outlining big topics in evolution. He beings with the eye.
Jellyfish belong to a branch of animals known as cnidarians that split off from the ancestors of bilaterians some 600 million years ago. Some species have simple photoreceptors, while others have full-blown camera-eyes hanging from their tentacles.
Eyes mounted tentacles, freakish image, that.
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