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Annelids
- 1975 ----- color ----- 10 min ----- 16mm
- A small anesthetised earthworm is shown dissected, featuring the pumping hearts. Focusing on the intestine, the camera shows peristaltic contractions which mix the food and send it along the intestinal tract. The undigested "castings" are expelled and their importance in soil ecology is discussed.
- Topics: (Zoology)
![[University of Washington]](http://www.washington.edu/home/graphics/uwsealf6.gif)
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