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Write four distinguishing characters of phylum- Echinodermata.
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  Characteristic features of Echinodermata are:

  • they are called echinoderms because calcareous spines are present on the body of these animals.

  • their skeleton is made up of calcareous spines/ossicles (plates).

  • they show radial symmetry in adult stage whereas they show bilateral symmetry in larval stage.

  • these animals have the ability of regeneration.

  • they are found only in oceans.

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