Posted by: Pdfprep
Post Date: February 1, 2021
A biology class examined the effects of small amounts of several chemicals on the heart rate of tiny water fleas. The graph shown at the left shows the results.
Which statement provides the best interpretation of the data?
A . Ethyl alcohol had no effect on the fleas’ heart rate.
B . All chemicals increased the fleas’ heart rate.
C . Tobacco juice increased the heart rate more than coffee.
D . The chemicals used in this study were stimulants.
E . Tea increased the fleas’ heart rate more than coffee.
Answer: C
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