1. Snail and Elodea Investigation

2. Directions:
Plan an investigation to collect data to support or contradict 7 hypotheses proposed in this investigation.

3. Questions: How are plants and animals interdependent on one another?
How is carbon cycled between plants and animals?

4. Hypotheses: 1: Snails give off CO2 in the light.
2: Elodea takes in CO2 in the light.
3: Elodea uses CO2 snails give off in the light.
4: Snails give off CO2 in the dark.
5: Elodea takes in CO2 in the dark.
6: Elodea uses CO2 that snails give off in the dark.
7: Elodea gives off CO2 in the dark.

5. Materials • glass vials with lids • test tube rack • distilled H2O
• pond snails: Lymnaea
• water plants: Elodea
• bromthymol blue (BB)
• straw (to add CO2)
• wax pencil
• lamp with 60 watt bulb
• dark cabinet

6. Procedure: Brainstorm Hypotheses 1-3
H1: Snails give off CO2
Experimental vs. Control set-up
H2: Elodea takes in CO2
H3: Elodea uses CO2 snails give off

7. Hypotheses 4 -7 How will you set these up?
Infer an appropriate design to test hypotheses 4-7
Create a table to represent the experimental and control procedure
Make specific predictions for experimental and control treatments