Which of the following are pioneer species on recently glaciated rock?
A) spruce and fir trees
B) herbs and shrubs
C) evergreens and fir trees
D) maples and redwoods
E) lichens and mosses
E
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The fact that the trees in central Alaska look like the trees in western Siberia, despite being separated by thousands of kilometers, illustrates the theory of
A) convergent evolution. B) multiple origins. C) global dispersal. D) plate tectonics.
How many essential fatty acids are there?
A) 0 B) 2 C) 3 D) 10
As one approaches the equator, the angle of incidence ________ and the atmosphere attenuation ________.
A. decreases; increases B. increases; increases C. increases; decreases D. decreases; decreases
Which of the following agriculture practices is a means to promote soil conservation?
A. terracing B. fallowing C. crop rotation D. all of these E. none of these