लोकोमोशन इन ए फाइट सिलेक्टेड इन अर्थवर्म बाय
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annelid
Locomotion
The basic features of locomotion in annelids are most easily observed in the earthworm because it lacks appendages and parapodia. Movement involves extending the body, anchoring it to a surface with setae, and contracting body muscles. When the worm begins a forward movement, circular muscles at the anterior end contract, extending the head forward. At the same time the anterior end lifts from the surface to facilitate forward movement.
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