In contrast to triploblastic animals, diploblastic animals have:
Correct answer: D. A gastrovascular cavity with one opening only
- A. Coelom lined by mesoderm
- B. Mouth and anus as two body openings
- C. A mesodermal layer that forms muscles
- D. A gastrovascular cavity with one opening only
Explanation
Diploblastic animals, like cnidarians, have two primary germ layers: ectoderm and endoderm. They possess a single opening that functions as both the mouth and anus, leading to a gastrovascular cavity, which is a characteristic feature of their body plan.
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