Which of the following are triploblastic and acoelomate?
Correct answer: C. Platyhelminthes
- A. Sponges
- B. Annelida
- C. Platyhelminthes
- D. Aves
Explanation
Platyhelminthes are triploblastic because they develop from three germ layers, and acoelomate because they lack a fluid-filled body cavity between the gut and body wall. Sponges do not have true germ layers, while annelids and birds are coelomate animals. Students may choose b by remembering that annelids are triploblastic but overlooking that they possess a true coelom.
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