A biologist discovers an aquatic organism that is unicellular with well-developed organelles, including two kinds of nuclei. The organism is an active predator that engulfs smaller unicellular organisms. The biologist also observes that occasionally individuals are found in pairs that remain connected for several hours. Based on this information, the biologist concludes that the organism is a

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Ciliates are characterized by having two types of nuclei (a large macronucleus and one or more small micronuclei) and are known for their predatory behavior, including engulfing smaller organisms. The observation of individuals remaining connected could indicate a form of sexual reproduction known as conjugation, which is common among ciliates.

A Biologist Discovers an Aquatic Organism That Is Unicellular with Well-Developed