Of the following which one is not the characteristic of triploblasts?
Correct answer: A. All of them have blood vascular system
- A. All of them have blood vascular system
- B. They may be coelomate pseudocoelomate or acoelomate
- C. They are included in grade bilaterian
- D. All of them have digestive system
Explanation
Triploblasts possess ectoderm, mesoderm and endoderm, but not all have a blood vascular system because simple triploblastic animals can transport materials by diffusion. They may be acoelomates, pseudocoelomates or coelomates and generally have a digestive system, so students may incorrectly reject option d by overlooking simple or incomplete digestive systems.
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