Many _expel large amount of water by special structures called contractile vacuoles:
Correct answer: D. Protozoa
- A. Porifera
- B. Fish
- C. Echinoderm
- D. Protozoa
Explanation
Contractile vacuoles are organelles found in single-celled uni-organisms such as protists, especially those living in freshwater environments.
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About Kingdom Protista
Kingdom Protista contains mainly unicellular eukaryotes, although some forms are colonial or multicellular, with varied nutritional and reproductive methods. Questions examine protozoans, algae and examples such as Amoeba, Paramecium and Euglena, while distinguishing protists from prokaryotes, fungi and true plants.
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