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A connecting link between Protozoa and Porifera is :

  • A.Chlamydomonas
  • B.Euglena
  • C.Protopterus
  • D.Proterospongia

Answer: D

The connecting link is Proterospongia.

Proterospongia is a colonial choanoflagellate: a protozoan whose collared flagellate cells are embedded in a jelly, resembling the choanocytes (collar cells) of sponges. It therefore links the Protozoa with the Porifera.

Euglena links animals and plants, Chlamydomonas is a green alga, and Protopterus is the African lungfish, a link between fishes and amphibians.

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