The Keeling graph, although it has yearly oscillations, shows that the concentration of CO2 in the atmosphere ________.
A. is remaining constant.
B. is steadily rising.
C. is slowly decreasing.
D. has sharp increases about every five years.
Answer: B
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An erosional coast that has little tidal variation:
A) can erode quickly because wave action is centralized. B) can erode slowly because there are no dramatic changes in tide. C) can erode quickly because it is inundated with large waves. D) can erode slowly because it becomes protected from large tidal variations.
What do the simplest vertebrates lack?
A) Jaws B) Notochord C) Central nervous system D) None of these choices
Pressure in a water distribution system during average consumption is ______ pressure.
a. residual b. static c. mean d. normal operating
Diaspora is defined as the spatial __________ of a previously homogeneous group.
A) isolation B) consolidation C) dispersion D) concentration E) none of the above