OESOPHAGUS STOMACH
ECHINODERMS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Asteroidea
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Crinoidea
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Echinoidea
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Holothuroidea
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Ophiuroidea
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Detailed explanation-1: -Holothuroidea (sea cucumbers) are one of five extant classes that make up the phylum Echinodermata. This is one of the most distinctive and diverse phyla, ranging from starfish to urchins to sea cucumbers and many other organisms.
Detailed explanation-2: -The phylum echinoderms is divided into five extant classes: Asteroidea (sea stars), Ophiuroidea (brittle stars), Echinoidea (sea urchins and sand dollars), Crinoidea (sea lilies or feather stars), and Holothuroidea (sea cucumbers).
Detailed explanation-3: -Holothuroidea in Greek means “violent expulsion, ” referring to their bizarre defense mechanism. When threatened, some species will eviscerate their internal organs, distracting their attacker so they can make a safe getaway.