Which of the following combinations is incorrect?
Correct answer: D. Calcarea-gastrovascular Cavity, coelom present
- A. Nematoda-roundworms, pseudocoelomate
- B. Arthropoda - coelom present, bilateral symmetry
- C. Platyhelminthes - gastrovascular cavity, flatworms, acoelomate
- D. Calcarea-gastrovascular Cavity, coelom present
Explanation
This combination is incorrect. Calcarea is a class of sponges (phylum Porifera), not a phylum on its own. Sponges do not have a gastrovascular cavity; instead, they have a simple body plan with specialized cells for feeding and water flow. Additionally, sponges lack a true coelom; instead, their body organization is based on a cellular level with no true tissues or organs. Therefore, the combination of "gastrovascular cavity" and "coelom present" is incorrect for Calcarea.
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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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