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Which one of the following groups of animals is bilaterally symmetrical and triploblastic?

1. Aschelminthes (round worms)
2. Ctenophores
3. Sponges
4. Coelenterates (Cnidarians)

Correct answer: Aschelminthes (round worms)

Solution

Aschelminthes (roundworms) are bilaterally symmetrical and triploblastic, meaning they have three germ layers and a left-right body plan. Ctenophores and cnidarians are not bilaterally symmetrical, and sponges lack true tissues and germ layers.

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