Biology / Bio 1993 · Atom · ~20 seconds
Protist Life Cycles
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Most protists reproduce asexually by binary or multiple fission, but many can switch to sexual reproduction, often triggered by nutrient depletion or environmental stress.
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Paramecium reproduces asexually by fission routinely, but conjugates sexually with a compatible mating type under stress, exchanging haploid nuclei.
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Sexual reproduction in protists is often facultative, not constant— many species reserve it for periods when conditions turn unfavorable.