The Scientists Found That the Level of Carbon Dioxide in the Air

question 43

Multiple Choice

The scientists found that the level of carbon dioxide in the air did not cause college students to yawn more frequently.What other experiment could they conduct to confirm that they should reject the hypothesis that yawning is regulated in the same way as breathing?

• A)Test the effect of hemoglobin amounts on the frequency of yawning.
• B)Test the effect of exercise levels on the frequency of yawning.
• C)Test the effect of carbon monoxide (CO)levels on the frequency of yawning.
• D)Test the effect of diet on the frequency of yawning.

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