Method:
1. Collect one giant African land snail and place it on a clean, firm surface. Wait for a few minutes until the snail has fully emerged from its shell and is used to its new surroundings.
2. Dampen a cotton wool bud with water.
3. Firmly touch the snail between the eye stalks with the dampened cotton wool bud and immediately start the stopwatch. Measure the length of time between the touch and the snail being fully emerged from its shell once again, with its eye stalks fully extended.
4. Repeat the procedure in step 3 for a total of ten touches, timing how long the snail takes to re-emerge each time.
5. Record your results in the table below and plot a suitable graph.
Limitations:
- Snails already handled before the experiment may not react in the same way
- Determining when a snail has fully emerged
- Lack of moisture may encourage snail to stay more in its shell
- Measuring eye stalk length instead
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