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Science · Earth sciences
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marks) 1. Earth is unique among the planets of our solar system because it has A an atmosphere. в, но. C. a biosphere D. internal layers (core, mantle, crust) E. All of the above answers are correct 2 Which of the following four properties is not generally characteristic of most biogeochemicat cycles? A. Cycling involves transformations to and from inorganic and organic forms B. Residence times vary among reservoirs C. Substances move among biotic and abiotic reservoirs D. Fluxes to and from reservoirs vary within the cycle, both temporally and spatially E. All of the above properties are generally characteristic of most biogeochemical cycles. 3. Emergent properties are A properties displayed by y vegetation that emerges during the growing season B. characteristics that are displayed by organisms, little by little, as they mature. C. evolutionary changes observed in organisms over geologic time. D. properties of a system that are not present in the individual components E. trees that stick out over the top of a forest canopy. of the system 4. Background extinction refers to A. normal extinctions that happen over time as a result of competition and e changes. B. the loss of much biota over a relatively short period of time. C. the five major mass extinctions of Earth history D. the impact of early humans on fauna as a result of over-exploitation. E. a genetic bottleneck. Oceans may have accumulated on Earths surface as early as 4.4 billion years ago. Why not earlier? 5. A. The surface of Earth was cold and lifeless before 4.4 billion years ago. B. The stabilization of liquid water required the origin of life before it could occur C. Before then, the surface of the planet was too hot for liquid water to persist. D. Earth itself is only 4.4 billion years old so it couldnt have had oceans before that. E. The components of water (H20) did not exist on Earth earlier than 4.4 billion years ago. 6. In comparison to wild capture fisheries, aquaculture operations tend to have significantly A. higher yields, in terms of kilograms of fish per square meter, per year. B. lower energy intensities. C. smaller ecological footprints D. lower costs in terms of inputs such as fossil fuels. E. None of the above answers is correct
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