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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About Kingdom Animalia
Animals are multicellular, heterotrophic eukaryotes whose cells lack cell walls and chloroplasts, with specialised tissues in most groups. Coverage includes body symmetry, tissue layers, coelom, segmentation and levels of organisation, plus major phyla such as Porifera, Cnidaria, Platyhelminthes, Annelida, Arthropoda, Mollusca and Chordata.
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