Read the following scenario and answer the question below.
In the early years of the 20th century there were lush stands of tall grasses in the valley on the east side of the Chiricahua Mountains in Arizona, stretching to Mexico on the south and New Mexico on the east. Dramatic summer rainstorms dumped huge amounts of water, very quickly, on the rocky upper slopes. The water ran down the slopes and into the grasslands, where it quickly soaked into the soft, porous soil where prairie dogs were active. Cattle ranching was in full swing, utilizing the rich grasses, but the ranchers did not appreciate the multitudes of prairie dogs that lived in the grasslands. Prairie dogs constantly dig through soil, making new burrows and eating grasses, roots and all. It was commonly believed that cattle would stumble in the prairie dog holes, break legs, and die of starvation. In addition, many ranchers were convinced that the prairie dogs would destroy the grasses because they directly competed with the cattle for food. The ranchers had already done away with most predators that might possibly affect cattle, and now they turned their attention to the prairie dogs. The ranchers became a part of a new federally sponsored movement to poison the grassland prairie dogs. This movement took root and spread through the 1920s and 1930s.
-Experiments done in Canadian lakes and in coastal regions of the Baltic Sea and Long Island Sound have demonstrated that _______________
A) the only micronutrient that is important is carbon
B) various macronutrients appear to limit growth throughout the world
C) only one micronutrient, phosphorus (phosphates) , limits growth throughout the world
D) only one micronutrient, nitrogen (nitrates) , limits growth throughout the world
E) the same few micronutrients limit growth throughout the world
Correct Answer:
Verified
Q9: What are Earth's structural spheres?
A)geosphere and atmosphere
B)lithosphere,
Q10: The majority of Earth's fresh water exists
Q11: By damming rivers, we are _
A)increasing transpiration
Q12: The eutrophication that has taken place in
Q13: The largest pool of carbon in the
Q15: Ecotones are the _
A)transitional zones between ecosystems
B)sounds
Q16: The biosphere consists of the _
A)solid earth
Q17: Humans have dramatically altered the rate of
Q18: Ecological modeling _
A)has been rejected because it
Q19: Read the following scenario and answer the
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