Based on the description of the experiment, the scientist is focusing on examining the effects of exercise on respiration by measuring the volume of gases (likely oxygen and carbon dioxide) produced during different activity levels (running, walking, and resting) over specific time periods.
From the provided options:
-
Does the amount of oxygen produced during physical activity depend on time? - This question is asking about the relationship between time and oxygen production, but the experiment measures gas produced during specific activities, focusing on those activities' impact rather than time alone.
-
Does increased activity lead to a higher volume of carbon dioxide produced? - This question fits well with the experiment's design, as the scientist is measuring respiration (which includes carbon dioxide production) at different activity levels.
-
Does the amount of time spent being active affect the volume of carbon dioxide breathed in? - Similar to the first question, this one focuses on time rather than the direct comparison of activities.
-
Does decreased activity require a higher amount of oxygen than increased activity? - This question suggests a comparison between oxygen requirements rather than the measurement of gas volumes produced.
Therefore, the best question that the scientist can directly answer with his experiment is:
Does increased activity lead to a higher volume of carbon dioxide produced?