Widely applying pesticides may lead to resurgence and secondary-pest outbreaks because
A) the insecticide also killed the natural competitors and predators of the pests.
B) the plants have now lost their ability to fight the pests.
C) pesticides typically harm plants in ways that take several years to appear.
D) new species that are more resistant to insecticides have evolved.
A
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Complete the concept map displayed below by selecting the correct response from the answers provided.
Suppose you were asked to evaluate the damage risk posed by a comet that was headed toward earth. Based on what you know about the average properties of comets, how would you evaluate the risk variables of density and speed for such a comet (as compared to other NEOs)?
A. High risk due to the density, low risk due to the average speed. B. Low risk due to the density, low risk due to the average speed. C. Low risk due to the density, high risk due to the average speed. D. High risk due to the density, high risk due to the average speed.
Any large cave formed by chemical processes is a
A) cavern. B) doline. C) karst valley. D) collapse sinkhole.
During 2016, the natural event that was responsible for the most disaster related deaths was ________.
A. earthquakes B. floods C. tsunamis D. heat waves
What is the principle underlying the Stratigraphic Record used for documenting global climate change?
a. The physical processes that operate in the modern world also operated in the past b. The nature of the sedimentary strata deposited at a certain location reflects the climate at that location c. The past climate of the Earth changed gradually over time d. None of the above