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Brittle stars are the most active of the echinoderms, using…
Brittle stars are the most active of the echinoderms, using their extensive and well-developed tube feet to chase and capture their prey.
Brittle stars are the most active of the echinoderms, using…
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The fishes, as we know them today, originated about 550 mill…
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The major difference between Placoderms and Acanthodians was…