Janice VanCleave’s Crazy, Kooky, and Quirky Biology Experiments

Janice VanCleave’s Crazy, Kooky, and Quirky Biology Experiments — page 7
too MuCh too Fast Purpose To demonstrate the effect of overfishing Materials scissors 2 dishwashing sponges ruler large bowl of tap water 2 tea strainers 1 small 1 large small bowl pencil writing paper helper Procedure 1 Cut each sponge into 1-inch 2 5 cm cubes 2 Place ten sponge cubes in the bowl of water spreading the cubes over the water's surface 3 Ask your helper to close his or her eyes and move the small strainer through the water once to scoop up as many cubes as possible 4 Remove the cubes from the strainer and place them in the small bowl 5 Count the cubes remaining in the water and add an equal number of cubes to double the amount of cubes in the water 6 Repeat steps 3 to 5 three times On the last scooping do not add any cubes Record the number of cubes in the water 7 Start over with ten cubes in the water 8 Ask your helper to do steps 3 and 4 four times using the large strainer Do not add cubes between scoopings After the last time 10 Janice VanCleave’s Crazy Kooky and Quirky Biology Experiments