You will need * test tube * wide-necked funnel * jar * Elodea (plant) Fill the jar with water then put the Elodea in the test tube. Fill the the test tube with water. Put your thumb over the bottom of the test tube and carefully put the test tube in the jar. Put the jar by a window and keep it inside your house. After a few days you will see that the water in the test tube is dropping. Why is this happening?
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