Which of the following statements describes how air molecules make the sky blue?
A. They selectively absorb blue light.
B. They selectively disperse blue light.
C. They selectively scatter blue light.
D. They selectively diffract blue light.
Answer: C
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Flies are destroying a farmer's crop despite years of investing in pesticides. Investigating an ecological pest control approach, he learn that the female flies that are killing the crop mate only once, lay their eggs, and then die
In fact, he can purchase sterile male flies to release around the crop to keep these flies from reproducing. Such a strategy represents A) genetic control. B) natural enemies control. C) cultural control. D) natural chemical control.
________ are federal lands that are off-limits to development but are open to hiking, nature study, and other low-impact public recreational activities
A) BLM lands B) Biosphere reserves C) Wilderness areas D) State parks E) National forests
Since the fall of the Soviet Union, ethnic conflicts have troubled Tajikistan, and Kyrgyzstan
Indicate whether the statement is true or false