What invention paved the way for technical advances in transportation at the time of the Industrial Revolution?
A) the wheel
B) the steam engine
C) the gear
D) the harness
E) braking systems
B
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A species' niche within a community describes
A. the species it competes with in the community. B. its position in a food chain or food web. C. the total set of biotic and abiotic resources it uses within the community. D. how it evolved in response to interspecific competition.
Which numbered feature(s) on this photograph are consistent with the presence of glaciers sometime in the past?
A) 1, an arête
B) 2, U-shaped valley
C) 3, tarn
D) All of these are correct.
When freshwater inflows into estuaries are reduced,
A) salt water intrudes into the system. B) freshwater species of plants and invertebrates may invade the estuary. C) populations of native species increase. D) freshwater enters marine ecosystems, causing loss of coastal biodiversity.
List some common anthropogenic greenhouse gases and common sources for them