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Remote Ready Biology Learning Activities has 50 remote-ready activities, which work for either your classroom or remote teaching.
Variables everywhere!
I agree. The models that have a dozen variables, while potentially interesting, tend to scare me off. If I knew exactly what they were trying to express, I might enjoy them more, but as it is I tend to be afraid of touching any of the variables. Also, if a model has too many variables, it's hard to see which one is making which changes. So while I, personally, might not go as simple as langton's ant, I do think that the variables and such should be kept to a minimum.