Science第 78 / 120 题
A study finds that a group of plants given fertilizer grew taller than plants without it. In this experiment, fertilizer is the—
a.dependent variable
b.independent variable
c.control group
d.conclusion
解析
The independent variable is the factor the scientist deliberately changes; here it is the fertilizer. The plant height that responds is the dependent variable. Well-designed experiments change only one variable at a time.
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