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Essay Details:
Essay text:
Human activities that change conditions in the air, water and land affect other organisms. We can add different chemicals to the yeast and determine what effects they have by measuring any differences in the observed respiration.
Equipment and Supplies:
For each person or group: 6 test tubes; test tube rack; 100 mL beaker; styrofoam cup (not as tall as the test tubes that you are using); larger beaker or other container to steady the styrofoam cup; thermometer; balance that can weigh gram amounts; 25 mL graduated cylinder; a teaspoon of rapid rise yeast; sugar; water; at least ten balloons that fit tightly over the test tube mouth (smaller balloons sizes are better; long and thin is better than round); vinegar; ammonia; liquid plant fertilizer; liquid bleach; small cups or beakers; heat source; pipettes or eyedroppers...
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