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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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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