Sentences with phrase «echinoderms take»
Echinoderms take calcium carbonate out of the seawater and use it to make their internal and external skeletons.
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The Devonian is often appropriately called the «Age of Fishes», since the fish took their place in complex reef systems containing nautiloids, corals, graptolites, blastods, echinoderms, trilobites, sponges, brachiopods and conodonts.