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Body Cavity

'Sand dollars...

Question

'Sand dollars', 'heart urchins' and 'sea urchins' are present in which of the following class?

A

Holothuroidea

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B

Asteroidea

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C

Crinoidea

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D

Echinoidea

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Solution

The correct option is D Echinoidea
The class Echinoidea contains organisms like the sea urchins, sand dollars and heart urchins. There are approximately 940 species of echinoids. They have a calcareous shell. They are composed of spherical or disk shaped plates and covered with movable spines.
Thus, the correct answer is option D.

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(i)	Crocodile	-	4-chambered heart
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