Identify the characteristic of 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
Acoelomates lack a coelom (neither true nor false/pseudocoelom). Hence they lack a cavity surrounding internal organs and have a solid body.
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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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