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Question options:a) habitat ecologyb) systemic analysisc) ecosystem ecologyd) biosphere studiesQuestion 122.5 / 2.5 pointsEcologists who study the way species interact with each other in a specified area are focused onQuestion options:a) habitats.b) communities.c) niches.d) biomes.Question 132.5 / 2.5 pointsWhich atmospheric layer enables radio transmissions?Question options:a) Troposphereb) Stratosphere
c) Ionosphered) ThermosphereQuestion 142.5 / 2.5 pointsThe foremost emitters of methane areQuestion options:a) oceans and rivers.b) oil and gas industries.c) landfills.d) sheep ranches.Question 152.5 / 2.5 pointsWhich planet is in the so-called "Goldilocks zone"?Question options:a) Earthb) Marsc) Jupiterd) VenusQuestion 162.5 / 2.5 points
The current rate of species extinction is conservatively estimated at _______ times greater than the background rate.Question options:a) 20 to 200b) 50 to 5,000c) 100 to 1,000d) 300 to 3,000Question 172.5 / 2.5 pointsWhich statement bestcharacterizes the temperate grassland biome? Question options:a) The rainy season lasts for six to eight months.b) During the parched dry season, fires turn vegetation to ash.c) This biome features perennial grasses as well as flowering plants called forbs.d) This biome includes strands of trees separated by grasses.Question 182.5 / 2.5 pointsAccording to the course, which of these has notbeen linked to damage caused by UVB radiation? Question options:a) Destruction of DNAb) Melanoma and premature aging
c) Basal cell and squamous cell carcinomasd) Severe sunburnQuestion 192.5 / 2.5 pointsA(n) _______ is the natural space inhabited by a particular plant or animal.Question options:a) habitatb) ecoregionc) communityd) ecosystemQuestion 202.5 / 2.5 pointsWhere did humans first domesticate horses?Question options:a) American high plainsb) Asian steppesc) African veldd) Argentine pampasLesson 5 ExamQuestion 212.5 / 2.5 pointsThe _______ ratio compares the number of economically productive people within a specific population to the number of people younger than 15 and older than 64.
Question options:a) dependencyb) productivityc) producer-consumerd) age to productivityQuestion 222.5 / 2.5 pointsWhich statement is trueregarding global population growth trends? Question options:a) Over the last 10,000 years, the human population has climbed slowly but steadily.