Students are actively engaged in building a pond ecosystem to be used later in observing and identifying micro invertebrates. This type of cooking requires using just the right ingredients, not necessarily in exact amounts. The test for success will come later in the "Beasties" lab experience.
 

             This stuff looks a little too dry to have any life in it. Are the critters in the water?

         Only time and a microscope will tell us if our ecosystem supports and sustains life…