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Hannah,
For biology, I have simulations available at www.biologysimulations.com. Generally, the target audience is high school, but I've tried a couple activities out on my 4th grade son and he had fun with them.
Natural Selection : Students play the part of a predator 'eating' prey that can be two different colors. The user chooses from three different environments.
Biodiversity : Not as interactive as the natural selection one, but could be useful for introducing the concept of biodiversity. Each time the simulation is run it produces a different group of animals (randomly selecting the number of species and the population of each species).
I don't think the provided worksheets wouldn work for elementary students, but you can probably come up with something that would work for your needs.
If you're looking for physical science options, check out PhET simulations...it may have some elementary options.
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