问题详情

WhyDid one scientist expose birds to artificialDaylight？
A.To test the relationship betweenDaylight and aDisease of the glands common tobords
B.To test the relationship betweenDaylight and migration．
C.To test the relationship between migration and temperature．
D.To test the relationship betweenDaylight and changes in the season．请帮忙给出正确答案和分析，谢谢！