Which is not a characteristic of triploblasts?
Correct answer: D. All of them have blood vessels
- A. They may be coelomate pseudocoelomate or acoelomate
- B. They are included in grade bilateria
- C. All of them have digestive systems
- D. All of them have blood vessels
Explanation
Triploblasts have three germ layers: the outer (ectoderm), inner (endoderm), and middle (mesoderm). This means that they are grade B bilaterians. They are further divided into acoelomate (no cavity), pseudocoelomate (false cavity-not in the middle), and coelomate (true cavity-formed by the splitting of mesoderm). They have a digestive system.
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