Epiphytic plants, such as various species of orchids (Orchidaceae), grow upon another plant, using the plants for physical support, but bringing no harm to the host plant. This is an example of which symbiotic relationship?
A) parasitism
B) mutualism
C) commensalism
D) amensalism
E) synnecrosis
C
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Shrinking industrial cities have
A) too much 'shock'. B) no 'buzz'. C) too much urbanism. D) violated the rank-size rule. E) spatial inequality.
Which phenomena involves the most equations in weather forecasting models?
A. atmospheric moisture B. changes in incoming energy C. atmospheric motion D. density changes
Which of the following best explains the pattern of atmospheric carbon dioxide seen above Slovakia in January 2004?
A) The relatively high levels of CO2 are the result of recent, widespread deforestation. B) The higher values are a result of Europe's large automobile fleet. C) There is no significant difference in CO2 in January compared to July 2004. D) The relatively high levels of CO2 are a result of diminished photosynthesis and respiration by flora during the low-sun season. E) The relatively low levels of CO2 are a result of diminished photosynthesis and respiration by flora during the low-sun season.
Which represents the proper pressure cell arrangement for the Hadley Cell?
A. low pressure at A, low pressure at B B. high pressure at A, low pressure at B C. low pressure at A, high pressure at B D. high pressure at A, high pressure at B