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Which animals are bilaterally symmetrical and triploblastic?

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

Options

(a) Aschelminthes (round worms)
(b) Ctenophores
(c) Sponges
(d) Coelenterates (Cnidarians)

Correct Answer:

Aschelminthes (round worms)

Explanation:

Aschelminthes is bilaterally symmetrical and triploblastic. These are mostly aquatic, free living or parasitic. Their body is three layered which is ectoderm, mesoderm and endoderm.

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