An advantage of testing for toxicity by exposing animals to chemicals is that using animals is
A. Cheaper than other methods
B. Usually quite humane
C. Easier than using computer models
D. A trusted and usually reliable way to get results
E. Faster than other methods
Answer: D
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The number of species of songbirds increased beginning in the Miocene. Indicate whether the statement is true or false
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Contour lines on a topographic map connect ____
a. points that are the same elevation b. points on the same road c. points that have the same vegetation cover d. points that have the same slope