Question

a) The movement of a snail on the ground which motion
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Answer 1

Answer:

Snails move by gliding along on their muscular foot, which is lubricated with mucus & covered with epithelial cilia. This motion is powered by succeeding waves of muscular contractions which move down the ventral of the foot.

Answer 2

Answer:

Snail possesses wavy movement with muscular contraction. It also secrets sticky substance called mucus which helps to reduce grip between the snail and the ground so that they can move easily.

but you can consider it rectilinear motion