Exam 4 & 5.docx - The current rate of species extinction is...

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The current rate of species extinction is conservatively estimated at _______ times greater than the background rate.c) 100 to 1,000Of the four modes of species interaction, trophic interactions are associated withd) predation.Where would you find a cold desert biome?d) AntarcticaWhich atmospheric layer enables radio transmissions?c) IonosphereAbout _______ percent of current carbon dioxide emissions are being absorbed into the planet's oceans.c) 50When ecologists study the way energy is distributed over a food chain or the rate at which nutrients are recycled, they're engaged in _______ in an effort to understand how the whole system works.c) ecosystem ecologyWhich side effect of urban sprawl is correlated to the time spent commuting from the suburbs to urban workplaces?d) Increase in air pollutionEcologists who study the way species interact with each other in a specified area are focused onb) communities.When carbon dioxide is dissolved in water, it produces _______ acid.c) carbonicAccording to the EPA, the second most significant factor in human-caused global warming and climate change isa) deforestation.The foremost emitters of methane areb) oil and gas industries.According to the course, which of these has notbeen linked to damage caused by UVB radiation?
b) Melanoma and premature agingTwo students are discussing causes of desertification in semi-arid locales. Allen maintains that overcultivation depletes soil of vital nutrients. Audrey argues that overgrazing strips vegetation and leadsto soil erosion and deforestation. Which student is correct?b) Both Allen and Audrey are correct.Where can the largest tropical forest on the planet be found?a) Amazon BasinWhere did humans first domesticate horses?b) Asian steppesWhich global region produces the most waste per capita?c) United States_______ is/are our planet's thermostat and the world's chief greenhouse gas.a) Water vaporPaul Ehrlich updated his early projections because his original ideas underestimatedc) human resilience.The discussion in the course regarding the experience of China during Mao Zedong's Great Leap Forward from 1959 to 1960 was meant to illustrate thata) population growth doesn't necessarily proceed at a steady rate.In developed countries, a fertility rate of 2.1 live births per 1000 births per year is called _______ fertility.b) replacementAccording to the course, all of the following factors are likely to be sources of social problems related to population density exceptb) spirituality.Ehrlich's dire projections differed from those of Malthus in that he applied the principle of geometric progression toa) vital resources like oil, copper, and top soils.In the modern world, how many countries are believed to be in Stage 1 of demographic transition?
d) 0In _______, death rates have declined markedly even as infant mortality rates continue as the highest in the world.

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