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  • Coral Bleaching

    Coral Bleaching


    (3 min 48 sec) Zoom into a coral reef and discover photosynthetic algae inside the coral’s cells. Reef-building corals rely on these symbionts for their survival.

  • Natural Selection of Lactose Tolerance

    Natural Selection of Lactose Tolerance


    (46 sec) Environmental and cultural factors can affect whether a new human mutation becomes common in a population.

  • Pocket Mouse Evolution

    Pocket Mouse Evolution


    (1 min 5 sec) This simulation shows the spread of a favorable mutation through a population of pocket mice. Even a small selective advantage can lead to a rapid evolution of the population.