Brain drain occurs when
A) highly educated citizens leave a country to move to another country.
B) schools are closed by civil unrest.
C) universities become unaffordably expensive.
D) agricultural experts leave cities for the countryside.
Answer: A
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A promising alternative to toxic pesticides used to reduce the billions of dollars in damage done by marine biofouling organisms is
A) marine predatory insects that eat the sessile biofoulers. B) polymers that make it difficult for the organisms to attach to a substrate. C) attracting fish to fouled sites to eat the fouling organisms. D) electrified ship hulls, intake pipes, and docks to electrocute the pests.
Which is NOT one of the world's most basic foods?
A) potatoes B) wheat C) rice D) cattle
What do unconformities represent? What will be an ideal response?
Taliks are present:
a. in the suprapermafrost zone b. at the permafrost table c. below the permafrost table d. above and below the permafrost table