What happens to the O2 and CO2 levels when one sprig of Elodea and one snail are put into a test tube with the lights on after 24 hours?
A: Drastic changes with oxygen increasing and carbon dioxide decreasing.
B: Drastic changes with carbon dioxide increasing and oxygen decreasing.
C: Oxygen and carbon dioxide vary slightly, but stay around their original levels.
D: There is no oxygen left in the test tube.
Which experiment yielded the most ideal conditions in the test tube for the snails and Elodea sprigs?
A: 2 snails, 2 sprigs, lights on
B: 1 snail, 2 sprigs, lights on
C: 1 snail, 2 sprigs, lights off
D: 1 snail, 2 sprigs, lights on
How do the snails and Elodea sprigs model interdependence
A: The snails receive oxygen and glucose from the Elodea sprigs. The Elodea sprigs receive oxygen from the snails.
B: The Elodea sprigs receive oxygen and glucose from the snails. The snails receive oxygen from the Elodea sprigs.
C: The snails receive oxygen and glucose from the Elodea sprigs. The Elodea sprigs receive oxygen, water, and light from the snails.
D: The Elodea sprigs receive oxygen and glucose from the snails. The snails receive oxygen, water, and light from the Elodea sprigs.
