Which concentration of ethanol is the most effective bactericide?
A) 100 percent
B) 70 percent
C) 50 percent
D) 40 percent
E) 30 percent
B
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A tracer is a substance with what attached to it?
a. water b. carbon c. a radioisotope d. an ion e. a positron
Which BMI range has the lowest relative risk of death?
A) 18-24.99 (normal weight) B) 25-29.99 (overweight) C) 30-34.99 (moderate obesity) D) 35 and above (severe obesity)
In early ancestors of the modern giraffe, longer necks allowed animals to reach higher tree branches as food. This would lead to ________ in the ancestral giraffe population.
A. disruptive selection B. sexual selection C. genetic drift D. directional selection E. stabilizing selection
The tentative explanation to be tested is called
A. a hypothesis. B. a theory. C. a hunch. D. the conclusion. E. the data.