Consider the cornfield with soil that had an amino sugar N content of 350 mg/kg in Study 2. Based on Figure 2 and other information provided, was the soil in the cornfield responsive or nonresponsive？
A. Responsive, because the yield did not increase.
B. Responsive, because the yield increased.
C. Nonresponsive, because the yield did not increase.
D. Nonresponsive, because the yield increased.
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使用手杖时，无论向哪个方向移动，都要先移动脚步，再移动手杖。()
Which of the students agree that the acceleration due to gravity varies with the mass of a
A. Students 1 and 2 only
B. Students 1 and 3 only
C. Students 2 and 3 only
D. Students 1, 2, and 3
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