Mrs. Alvarez's class is conducting an experiment to assess the exchange of carbon between photosynthesis in elodea plants and cellular respiration in snails. The experiment required the use of a pH indicator that turns yellow in response to a high concentration of a waste product released during these processes. The results are displayed in the table.
Test Tubes
Contents
Starting Color
End Color
A
Water
Green
Green
B
Water and 2 snails
Green
Yellow
C
Water and 2 elodea
Green
Green
D
Water, 2 snails, and 2 elodea
Green
Yellow
Which of the following experimental questions is BEST answered through the use of this pH indicator?
