Which of the following characteristic belongs to acoelomates?
Correct answer: D. Solid body without a cavity surrounding internal organs
- A. Absence of mesoderm
- B. Absence of brain
- C. Coelom that is incompletely lined with a mesoderm
- D. Solid body without a cavity surrounding internal organs
Explanation
This is the correct characteristic of acoelomates. Acoelomates are organisms with a solid body plan, meaning they lack a fluid-filled body cavity like a coelom that surrounds their internal organs. Instead, the space between the outer body wall and the internal organs is filled with mesodermal tissue, which is often densely packed, giving them a solid appearance.
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