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Question 12 of 405.0/ 5.0 PointsEcologists who study the way many species interact with each other in a specified area are focused on:
A. habitats. B. communities. C. niches. D. biomes. Question 13 of 400.0/ 5.0 PointsIn which of these semi-arid grasslands did people first domesticate horses?A. The American high plains B. The Asian steppes
C. The African Veld D. The Argentine pampas Question 14 of 400.0/ 5.0 PointsWhich of these side effects of urban sprawl is mainly related to driving time spent commuting from the “burbs” to urban workplaces?A. Excessive use of water resources B. Increased risk of obesity C. Destruction of wildlife habitats D. Increased air pollution
Question 15 of 405.0/ 5.0 PointsExtinctions are not rare. Over an extended period of time, based for example on fossil evidence, a certain number of species will become extinct each year. Thus, experts can estimate a background rate of species extinction. Using that estimate, researchers can compare it to the current extinction rate over, for example, the last two decades. What they have found is startling.According to cautious estimates, the current extinction rate is __________ times greater than thebackground rate.A. 20 B. 50 C. 100 D. 300 Question 16 of 405.0/ 5.0 PointsWhich of these global regions produces the highest level of waste per capita?A. China
B. India C. United States D. Europe Question 17 of 405.0/ 5.0 PointsAmong the types of desert biomes, where would you find a cold desert?A. Along the coast of Chile B. Along the coast of Morocco C. Utah or Montana
D. Greenland Question 18 of 405.0/ 5.0 PointsAccording to the EPA, the second most significant factor in human-caused global warming and climate change is:A. deforestation. B. the burning of fossil fuels. C. desertification. D. that species die off. Question 19 of 405.0/ 5.0 PointsThe ozone layer contains about __________ percent of atmospheric ozone.
A. 60 B. 75 C. 90 D. 99 Question 20 of 400.0/ 5.0 PointsThe actual location of some natural space inhabited by particular flora and fauna is called a/an:A. habitat. B. ecoregion.
C. community. D. ecosystem. Part 2 of 2 - 80.0/ 100.0 PointsQuestion 21 of 405.0/ 5.0 PointsToday, respecting transition theory, how many countries are considered to be in Stage 1?A. Fewer than 20 B. Between 30 and 40 C. Fewer than 10 D. Zero
Question 22 of 405.0/ 5.0 PointsToday, the greatest threat of famine is associated with:A. underdeveloped infrastructure as a hindrance to efficient distribution. B. political instability resulting from armed conflict. C. the inefficient use of energy and water resources.