How can Integrated Pest Management help to reduce threats to species?
A. By using conventional pesticides only as a last result
B. By using conventional pesticides as a precautionary approach
C. By eliminating any species that threatens food crops
D. By increasing pesticide use to increase crop yields
Answer: A
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Which of the following events can cause saltwater intrusion?
a. Excessive withdrawal of groundwater in coastal areas b. The decline of sea level c. Headward erosion of streams d. Dissolution rocks by acid groundwater
What type of rock is shown in this photograph?
A. crystalline rock B. rock with minerals that are too small to see C. clastic rock D. None of these choices are correct.
Because lenses act like a prism to separate the colors of the spectrum, they produce a troublesome effect known as ________
A) focal distortion B) light dispersion C) the atmospheric effect D) poor seeing E) chromatic aberration
El Niño Southern Oscillation (ENSO) is responsible for worldwide climate fluctuations. Why is the fishing economy of Peru greatly affected by these fluctuations?
a) Cold, nutrient-poor water has covered the warm, nutrient-rich waters near Peru's coast. b) The La Niña is a cool phase that decreases fisheries. c) Monsoons in the North Indian Ocean cause a decrease in Peru fisheries. d) Cold, nutrient-rich upwelling waters that facilitate the fisheries were covered by the warm, nutrient-poor waters of El Niño.