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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