2
Q:
| A) Asterias | B) Sea anemone |
| C) Nereis | D) Euchinus |
Answer: A) Asterias
Explanation:
Explanation:
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.
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