These animals have three germinal layers but no coelom:
Correct answer: A. Flat worms
- A. Flat worms
- B. Round worms
- C. snails
- D. Chordates
Explanation
Flatworms and cnidarians are the only animals in the list that have three germinal layers but no coelom. Germinal layers are the three layers of cells that form the embryo of an animal. The three germinal layers are the ectoderm, the mesoderm, and the endoderm. Coelom is a fluid-filled cavity that surrounds the internal organs of an animal.
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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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