The part of a lens where minimum or no redirection of a light ray is the
A. middle of the lens.
B. depends on the kind of lens.
C. outer part of the lens.
D. none of the above
Answer: A
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What makes it possible for the coexistence of several warbler species that feed on the same insect larvae?
A) Some of the warblers are diurnal and some nocturnal. B) The birds eat in the same portion of different evergreens. C) The birds eat in the different portions of the forest canopy. D) The warblers do not experience intraspecies competition. E) The birds eat in the same area of different fir and spruce trees.
In the accompanying figure, the sequence of weathering changes over time will ________.
Fill in the blank(s) with the appropriate word(s)
On average, what percentage of solar energy striking the outer atmosphere eventually reaches Earth's surface?
a. ?5 percent b. ?15 percent c. ?30 percent d. ?50 percent e. 70 percent?
The Southern rural region that is one of the materially poorest in the United States is
A. the Florida Panhandle B. the Carolina Piedmont C. the Mississippi Delta D. southern Georgia