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Ciliates differ from all other protozoans in

1. using flagella for locomotion
2. having a contractile vacuole for removing excess water
3. having two types of nuclei
4. using pseudopodia for capturing prey

Correct answer: having two types of nuclei

Solution

Ciliates are distinguished by nuclear dimorphism: they possess a macronucleus for everyday cell functions and a micronucleus for reproduction. The other options describe features found in other protozoans or in many protists, not specifically ciliates.

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