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bottle ecosystem... look like some great windowsill project.

Self-contained Ecosystems. I would use "sea monkeys" instead of guppies on the bottom....

Self Contained ecosystems in a bottle, perfect for a hand on science lab.

Science Fundamentals: Ecosystems and Biomes

pot plus top of pop bottle = homemade terrarium

Life-Sized Body Map, includes bubble wrap for lungs, crepe paper streamers for intestines, cotton swabs for finger bones. #classicalconversations

Walking Water- homeschool science experiment for young children.