Which of the following types of fog are known as "arctic sea smoke" and "steam devils"?
A. advection fog
B. radiational fog
C. upslope fog
D. evaporation fog
Answer: D
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The average total fertility rate needed to maintain a population at its current level is
A. 1.5 B. 2.0 C. 2.1 D. 3.2
Despite a low net primary productivity (NPP), which ecosystem or life zone produces the most biomass each year?
A. swamps and marshes B. tropical rain forest C. temperate forests D. open ocean E. estuaries
Which is true of the level of CO2 in our atmosphere?
A) The level of CO2 is decreasing at 3.1% per year. B) Scientists largely believe the rapid increase is the result of volcanic activity. C) It is reached 404 ppm in 2015. D) The level of CO2 was much higher in 1955 than today. E) The rate of increase leveled out in 1976.
When ribose adopts a furanose structure which carbon is the anomeric carbon?
A) C-1 B) C-2 C) C-5 D) C-6