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1. What special structures are specific to the phylums of Porifera, Cnidaria, Ctenophora, and Platyhelminthes?

1. What special structures are specific to the phylums of Porifera, Cnidaria, Ctenophora, and Platyhelminthes?
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1. What special structures are specific to the phylums of Porifera, Cnidaria, Ctenophora, and Platyhelminthes?

User Redcurry
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The special structures of the following phylums:


  • Porifera: members of this phylum have special collar cells. They have cellular level of body organisation.
  • Cnidaria: members have stinging cells on the tentacles surrounding mouth.
  • Ctenophora: members have comb like ciliary plates for swimming.
  • Platyhelminthes: For the first in animal kingdom, members of this phylum there is development of sensory and nervous tissue in the head region (cephalization)

User Bstoney
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