49. What could be another possible cause for changes in sleep patterns?
(A) The change from one season to the next.
(B) Extreme changes in climate conditions.
(C) The amount of noise throughout the day.
(D) Biological differences in individuals.

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統計： A(31), B(32), C(39), D(278), E(0) #2756898

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The scientists say further research is needed to help explain other possible causes for the changes in sleep patterns in the test subjects. Such causes could involve biological differences in individuals or social patterns within communities.

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