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How does locomotion take place in leech?...

How does locomotion take place in leech?

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(i) Looping or Crawling movement and
(ii) Swimming movement
(i) Looping or Crawling movement: Looping movement is brought about by the contraction and relaxation of muscles. The two suckers serve for attachment during movement. The animal fixes its posterior sucker on the substratum.
(ii) Swimming movement: The animal swims in the water by undulating movements of the body.
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