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    				| 1. | How does a snail move? Why is mucus important for its movement? | 
| Answer» y gastropods the power for locomotion is provided by muscular waves moving along the ventral surface of the foot1–3, the force of these waves being coupled to the substratum by a thin LAYER of pedal MUCUS. This mucus acts as a glue, allowing the animal to ADHERE to the substratum on which it crawls2,3. | |