Science Enhanced S&S Biology - Virginia Department of ...

2. Have students add enough of the bromthymol blue solution (2 to 3 mL) to each bottle to obtain a green color. 3. Direct students to add the following items to the containers and then to seal them tightly: #1. Sprig of Elodea #2. Snail #3. Sprig of Elodea and Snail #4. Nothing (the control) 4. Place the containers near a light source. 5. ................
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