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How does locomotion take place in leech?...

How does locomotion take place in leech?

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Locomotion in leech takes place by (i) looping or crawling movement (ii) Swimming movement.
(i) Looping or Crewling movement :
This movement is brought about by the contraction and relaxation of muscles.
The two suckers serve for attachment during movement on a substratum.
(ii) Swimming movement :
Leeches swim very actively and perform undulating movements in water.
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