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Endoskeleton: Quiz

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Question 1: In three phyla and one subclass of animals, endoskeletons of various complexity are found: ________, Echinodermata, Porifera, and Coleoidea.
ChordateAnnelidVertebrateTunicate

Question 2: An endoskeleton is an internal support structure of an ________, composed of mineralized tissue.
CtenophoraCnidariaBilateriaAnimal

Question 3: The Coleoidae do not have a true endoskeleton in the evolutionary sense; here, a mollusc exoskeleton evolved into several sorts of internal structure, the "cuttlebone" of ________ being the best-known version.
CephalopodSquidOctopusCuttlefish







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