54. Which one of the following has a bilateral symmetry in its body organization? A.Asterias B.Sea anemone C.Nereis D.Euchinus
Answer: Option A Solution: Asterias has bilateral symmetry only at larval stagebut fivefold symmetry (pentamerism, a special type of radial symmetry) as adults. Nereis do not possess any symmetry elements in their body organisation.
