In this activity, the students are to create a self-sustaining ecosystem in a 2L bottle (or bigger).
The students use a 2L bottle, along with gravel, live plants, snails, and guppy fish to create a self-sustaining ecosystem that can last for a long term.
The students are asked to identify the producers, consumers, and their trophic level with their ecosystem. In addition, they are to track their observations of ecosystem on a daily basis.
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