[IB Biology SL at GHS: Ecology Unit Reviews]

17. Which of the following animal phyla has radial symmetry?

A) Porifera and Cnidaria

B) Annelida and Cnidaria

C) Platyhelminthes, Annelida, Arthropoda, & Cnidaria

D) Cnidaria

E) None of these phyla has radial symmetry.

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Slichter