OESOPHAGUS STOMACH
ECHINODERMS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Crinoidea
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Asteroidea
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Echinoidea
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Holothuroidea
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Ophiuroidea
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Detailed explanation-1: -Echinoderms, which are exclusively marine animals, are divided into five classes, the Asteroidea (starfishes), Ophiuroidea (serpent-stars), Echinoidea (sea-urchins, heart-urchins, and sand-dollars), Holothuroidea (sea-cucumbers), and Crinoidea (sea-lilies and feather-stars).
Detailed explanation-2: -Asteroids can range from less than 2 cm to over one m in diameter, although the majority are 12 to 24 cm. Arms extend from the body from a central disk and can be short or long. A majority have 5 arms, although some can have up to 40.
Detailed explanation-3: -Description. Organisms in the Class Asteroidea have several arms (usually between 5 and 40) arranged around a central disk.
Detailed explanation-4: -Members of class Asteroidea are commonly known as sea stars or starfish (though they certainly aren’t fish).