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- Biome distribution depends on ______. a. climate b. elevation c. soils d. all of the aboveThe image above is a screenshot taken from an online image sharing website, imgur, showing flowers that allegedly grew from the aftermath of the Fukushima Nuclear Powerplant disaster in 2011. Question: “Do you think this post provides strong evidence of the actual conditions of the area?”Biome distribution depends on ______. a. climate b. elevation c. soils d. all of the above
- Decomposing organic matter in soil is called _____. a. clay b. humus c. topsoil d. silt e. sand f. leachingTwo arctic marine mammals that live in the same waters differ in the level of pollutants in their bodies. Bowhead whales have a lower pollutant load than ringed seals. What are some factors that might explain this difference?Organisms at the lowest trophic level in a tallgrass prairie are all _______. a. two steps away from the original energy input b. autotrophs c. heterotrophs d. both a and b e. both a and c
- Energy Efficiency of Biofuel Production Most of the plant material currently used for biofuel production consists of food cropsmainly corn, soybeans, and sugarcane. In 2006, David Tilman and his colleagues published the results of a 10-year study comparing the net energy output of various biofuels. The researchers grew a mixture of native perennial grasses without irrigation, fertilizer, pesticides, or herbicides, in sandy soil that was so depleted by intensive agriculture that it had been abandoned. They measured the usable energy in biofuels made from the grasses, and also from com and soy, then measured the energy it look to grow and produce biofuel from each kind of crop (Figure 6.1). FIGURE 6.1 Energy input and output of biofuels made from three different crops. One hectare is about 2.5 acres. About how much energy did ethanol produced from one hectare of corn yield? How much energy did it take to grow the corn to make that ethanol?Nitrogen deficiency stunts plant growth and causes leaves to turn yellow and then die. Why does nitrogen deficiency cause these symptoms? Hint: Think about which biological molecules incorporate nitrogen atoms.Which term describes the process whereby toxic substances increase along trophic levels of an ecosystem? biomassification biomagnification bioentropy heterotrophy
- Figure 21.6 The Svalbard seed vault is located on Spitsbergen island in Norway, which has an arctic climate. Why might an arctic climate be good for seed Storage?The _____ cycle is a sedimentary cycle. a. phosphorus b. carbon c. nitrogen d. waterEfficiency of energy transfers in aquatic ecosystem is typically higher than in land ecosystems because ______. a. aquatic food webs include more endotherms b. algae do not make lignin c. primary production cannot occur in water d. all of the above