■ pond water or dechlorinated tap water
■ gravel, rocks, and soil
1. In this investigation, you will observe organisms in
■ graph paper
one of three different ecosystems. Look at the
■ 82 x 11 in. acetate sheets
organisms listed in the materials list, and choose
■ several colored pens for overhead transparencies
the ecosystem you would like to observe. Which organisms might be the most numerous? Which
organisms might decrease in number? Hypothesize
■ pinch of grass seeds
how the organisms will interact.
■ pinch of clover seeds
2. Form a group with classmates who have all chosen
■ 10 mung-bean seeds
the same ecosystem. As a group, prepare the envi-
■ 3 earthworms
ronment in a jar with a chosen substrate. Go to Part
■ 4 to 6 isopods (pill bugs or sow bugs)
A, Part B, or Part C for set-up instructions for your
■ 6 mealworms (darkling beetle larvae)
■ 6 crickets
3. Put lids on the containers, and let the ecosystem remain undisturbed in indirect sunlight for a week.
Go to Part D after one week.
■ 5 to 15 strands of aquatic plants
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