Organisms contribute to soils formation by ________
A) stirring the soil to allow air infiltration B) degrading organic matter to form humus
C) contributing organic matter to the soil D) all of the above
D
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Define "routes" and "events" in dynamic segmentation.
What will be an ideal response?
According to the United States Census Bureau, a Mexican American might also be considered a member of which races?
A) Japanese, Cuban, or another B) black, Mexican, or another C) black, white, or another D) white, Guatemalan, or Mexican E) white only
What does the "rule of 70" apply to?
A) how long it takes a population to double in size B) death rates during a famine C) migration from one continent to another D) economic prosperity in a former colony E) cartograms of world population
All of the following have been recognized as earthquake precursors except
A. changes in frequency of seismic sea waves. B. changes in electrical resistivity of rocks. C. changes in the ground's surface tilt. D. changes in radon content of well waters.