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2015-08-29T11:24:41+08:00
Earthworms have a hydrostatic skeleton . They move by squeezing the circular muscles of each segment to make their body extend forward , then they grip the surface with their bristles and contract their longitudinal muscles so that their body is pulled up to their anterior .
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2015-08-29T12:33:16+08:00
Earthworm support they body system by hydrostatic sceleton
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