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Hey Georgia! One lab that I have used for ZooTeens at a zoo (my job), teaching elementary school students about ecosystems, and with high school environmental science, marine science, and biology classes is testing water for temperature, pH, nitrates, and other organic materials. This can meet homeostasis of an ecosystem standards, and makes it extremely hands on! They can also test a couple different bodies of water (pick a few students to bring in water or actually go to a bodies of water close to the school) to figure out whats going on in the body of water, what are the causes of abnormal results, and the effects of those abnormal results. It requires students to make a logical connection or reasoning between their evidence and claim and hits on many tenets of the Nature of Science.
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