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Answer: 4. having two types of nuclei

Key idea: Ciliated protozoans such as Paramecium have two types of nuclei: a large macronucleus and one or more small micronuclei.

Other protozoans do not have this feature. Contractile vacuoles occur in many freshwater protozoans, and flagella and pseudopodia are used by other groups.

Answer: option 4.

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report
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