I liked the predator/prey activity. I thought another way this could be adapted was to actually have the students put the utensils into their mouths to pick up the "food". If nothing else, it may provide for a chuckle or two! :) Since I am on the math end and not the science, we do exponential decay and growth using M&Ms. The kids love the activity and it provides for great graphs.
The crystal violet lab was great also. I am getting a plethora of ideas to use when my students ask, "Why do we have to do this?". Another good example of exponential functions as well as well as linear. We won't actually do the natural logs of numbers, but I can tell them how they'll need it in the future.
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