Online simulation of natural selection. Different numbers of predator and prey can be chosen, as well as different environmental conditions. All University of Colorado PhET simulations have associated Teaching Resources, associated Learning Outcomes, and translations into many languages.

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Online simulation of membrane channels. Users can change concentrations of channels and molecules present. This will also illustrate the rate of diffusion. All University of Colorado PhET simulations have associated Teaching Resources, associated Learning Outcomes, and translations into many languages.

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Online simulation of how the lac operon works. There are two screens, one where the user can simulate lactose regulation and one where lactose transport is simulated, both have changeable conditions. All University of Colorado PhET simulations have associated Teaching Resources, associated Learning Outcomes, and translations into many languages.

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