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World 8 · Natural selection · 8 min · PRO

Clean air: reversing the trend

PRO · Genetics

World 8: Natural selection is part of PRO

The first world of Genetics is free. PRO opens the other 44 lessons in 7 worlds — simulations, quizzes and all.

  • Seen and eaten: selection by predators
  • Chance without selection: genetic drift
  • No variation, nothing to select
PRO includes
  • All 26 labs — every world, every lesson
  • Practice exams and certificates

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Unlock GeneticsTry the free world
← Chance without selection: genetic driftNo variation, nothing to select →

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