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How to use Hydra as a model system to teach biology in the classroom

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Figure

Fig. 1. Hydra fishing in the Canton of Geneva, Switzerland. (A,B) Patricia Bossert collecting wooden sticks and floating plants (Lily pads) on which she found Hydrapolyps attached
Fig. 2. Assessing Hydrain multi-well dishes for several days. Meanwhile, dissociated animals should be systematically discarded and the culture dishes thoroughly washed as  health: the Hydra Health Index – HHI - (after Johnson and Gabel, 1983)
Fig. 3. Artemia culture and preparation of Hydra food. (A) Facility to obtain hatched Artemia: a one liter glass bottle, submerged in a water bath maintained at 28ºC, is continuously aerated with a glass pipette attached to a tubing connected to an air pum
Fig. 4. Daily maintenance of Hydrafilter are transferred to a 2 liter glass beaker and washed by suc- culture
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