Amphioxus belong to the group of cephalochordates, the most basal group of chordates. They are small marine animals, only a few centimeters long, that resemble tiny fish in appearance. They...
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Echinoderms include well-known animals like starfish and sea urchins, as well as lesser-known organisms such as sea lilies (crinoids), sea cucumbers, and brittle stars. Like all the animals studied in...
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