Whose body wall is made of calcium carbonate?

  • A
    Scorpion
  • B
    Prawn
  • C
    Cockroach
  • D
    Sea urchin

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The water vascular system is a characteristic feature of which phylum?

Which of the following animal groups exhibits radial symmetry?

The larval stage in Asterias is:
$(a)$ Absent
$(b)$ Free-swimming
$(c)$ Bilaterally symmetrical
$(d)$ Radially symmetrical

Which organ system is lacking in the animals that bear a water vascular system?

Which of the following is a characteristic of Phylum $Echinodermata$?

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