Initial testing on mice indicates that a new food coloring is a carcinogen. Now the researchers hope to examine the effects of different concentrations of the carcinogen on mice in a type of
A) exposure assessment.
B) dose-response assessment.
C) hazard assessment.
D) risk characterization.
B
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"Sweet" and "fresh" water are distinguished from each other on the basis of taste. Indicate whether the statement is true or false
Walking along the woods, a student spot a lizard that quickly runs under some leaves that are resting on the forest floor. Looking under the leaves to find the lizard, he notices that the soil is very moist despite several days without rain
This moist soil layer under the leaves is a result of A) humus with a high water-holding capacity and reduced evaporative loss in the O horizon. B) sand with a high water-holding capacity with water supplied from the B and E horizon. C) low infiltration and high evaporative loss in the B horizon. D) a low water-holding capacity of the lower soil layers and high evaporation through the top soil layers.
A glaciated valley is ________ shaped; a stream cut valley is ________ shaped
A) V-; V- B) U-; S- C) V-; U- D) U-; V- E) V-; S-
Which of the following terms does not belong with the others?
A) Speleothem B) Hydrothermal activity C) Hot spring D) Fumarole E) Geyser