Easy to culture and easy to see, this aquatic oligochaete worm makes a very versatile classroom experimental animal. Culture this worm and use it throughout the school year for multiple studies. The nearly transparent worm has distinct segmented parts - and an especially prominent dorsal blood vessel which pumps like a heart. Chemical effects on the pulsating blood vessel are easily observed and timed. This is an ideal organism for studies of behavior, locomotion, regeneration, and drug studies. Comes with background and culturing information. Pkg. of 30.