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Explain how an earthworm moves.

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Explain how  an  earthworm  moves.  

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The body  of  the earthworm  is made of many rings  which  are joined  end  to end. These rings help  the earthworm  to move forward.  The muscles in the body  help  the        earthworm to extend  and  shorten  its  body. At first,  the front  portion of  the body  extends and  the rear portion of the body remains  fixed  to  the ground. Then the earthworm fixes the front  end  and  releases  its rear  end.  This  helps  it  to shorten  its  body  and  to  move forward. By repeating the same  movement by  contracting and  relaxing  the muscles,  the earthworm moves ahead.

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