Explain the difference between threshold dose-response models and nonthreshold dose-response models.
What will be an ideal response?
With the threshold dose-response model, a certain level of exposure to the chemical must be reached before any detectable harmful effects occur. With the nonthreshold model, any dosage of a toxic chemical causes harm that increases with the dosage.
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Using the stereogram, describe the location of an apparent overhanging cliff. M32
The question is based on Figure 32-3, a black-and-white stereogram, and color Maps T-20a and T-20b (in the back of the Lab Manual). These maps show the entrenched meanders of the Green River near Canyonlands National Park, Utah. A larger portion of this region is shown in color Map T-7 in the back of the Lab Manual. Begin by looking at the flat-topped, half-circle-shaped hill about 4 centimeters (1.5 inches) from the bottom of the stereogram. What will be an ideal response?
Which plate does the westward-moving South American Plate encounter in South America??
A) ?Cocos plate B) ?Juan De Fuca plate C) ?Farallon plate D) ?Nazca plate
Which biome is characterized by permafrost?
A) Tundra B) High latitude temperate forests C) Cold deserts D) High latitude coniferous forests
Any solution with a pH of greater than 7.0 is acidic.
a. true b. false