Let us continue to analyze the existing data:
  1. First let us examine the pH changes which occur in the food vacuole as it progresses through the digestion cycle of the organism, as illustrated in the figure at the right.
  2. Next look at graphs of pH vs. time presented on the left.
Which of the graphs on the left represents the pH changes occurring during food digestion by the food vacuole
[Click on the figure you choose.]

A.                                                                        B.

C.                                                                         D.