Final answer:
If the pH inside the mouth has changed from 6.6 to 4.4, without additional information on external factors, it's difficult to predict the exact behavior of the pH thereafter. It may continue to decrease, stabilize, or increase depending on various conditions and the biological response.
Step-by-step explanation:
When the pH inside the mouth changed from 6.6 to 4.4 at 60 seconds, predicting what the graph would look like after 60 seconds requires understanding how pH levels change in response to the environment and chemical reactions in the mouth. If the pH has decreased to 4.4, this indicates an increase in acidity. Without additional information, it is not possible to predict with certainty how the pH will behave after this point, as it can depend on various factors such as buffering capacity in the mouth, further intake of acidic or alkaline substances, and the natural biological responses intended to neutralize pH. However, based on the options provided:
- Option A (The pH will continue to decrease) suggests a continual introduction or production of acid in the mouth.
- Option B (The pH will stabilize at 4.4) suggests that the conditions causing the decrease have ceased and a buffer system might be at work.
- Option C (The pH will increase) suggests that there might be a neutralizing agent at work that is starting to counteract the acidity.
- Option D (The pH will return to 6.6) suggests a strong neutralizing process that not only halts the acidity but also restores the pH to its initial state.
Without further context it's difficult to accurately predict which will occur, but given that a drop in pH indicates increasing acidity and that no neutralizing factors have been mentioned, Option A or B are more likely than Option C or D.