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

  1. A
    Aschelminthes (round worms)
  2. B
    Ctenophores
  3. C
    Sponges
  4. D
    Coelenterates (Cnidarians)

Solution & Step-by-step Explanation

1. Sponges: Asymmetrical or radial; diploblastic.2. Coelenterates/Ctenophores: Radial symmetry; diploblastic.3. Aschelminthes: First group to exhibit bilateral symmetry and triploblastic (three germ layers) body organization, along with a pseudocoelom.

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Which one of the following groups of animals is bilaterally symmetrical and triploblastic?
A
Aschelminthes (round worms)
B
Ctenophores
C
Sponges
D
Coelenterates (Cnidarians)

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Animal KingdomClassificationSymmetry

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