The skeleton of the class $Demospongiae$ is made up of ..........

  • A
    Calcareous spicules
  • B
    Siliceous spicules
  • C
    Spongin fibers
  • D
    Both spongin fibers and siliceous spicules

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Give the characteristics of Phylum Porifera.

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Sponges are ..........

Which phylum of animals,despite being multicellular in structure,does not exhibit division of labor?

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