Snail has a thick muscular foot.still its movement is slow as compared to earthworm why

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Please find below the solution to the asked query                                                                

A hard shell is present on the back of a snail. It acts as the skeleton in snail and makes its movement slower than the earthworm which ​does not contain any shell.
The thick muscular foot present for movement in a snail helps it to maintain a balance while walking as the weight of shell present on the back is high. 

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Because it's shell is very heavy and earthworms don't have shells.
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