What protists has a micro and macro nucleus?

Ciliates, a group of protists, possess both a macronucleus and one or more micronuclei. The macronucleus is responsible for regulating the cell's metabolic processes and controlling everyday functions, while the micronucleus plays a crucial role in reproduction and genetic exchange during conjugation. This dual-nucleus system allows ciliates to efficiently manage their cellular activities and genetic diversity. Examples of ciliates include Paramecium and Tetrahymena.