NAFTA (North American Free Trade Agreement) is an agreement that does what?
A) Allows the free migration of people between countries in North America
B) Limits tariffs and trade restrictions
C) Ensures that all countries have strong environmental and workers rights regulations
D) All of the above
B
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The acquired immune cells that target pathogens in infected cells are
A) B cells. B) T cells. C) antibodies. D) antigens.
Currently, the number of years required for the world's population to double is approximately:
A. 53 years B. 73 years C. 43 years D. 13 years E. 93 years
The study of paleomagnetism is possible because ____
A)the magnetic minerals in rocks create Earth's magnetic field B)most rocks contain no magnetic minerals C)each continent has its own magnetic pole D)the magnetic minerals in a cooling lava point toward the north magnetic pole E)the Curie point of minerals changes constantly
A conductor and an insulator are actually
A. one and the same. B. opposites. C. similar in some substances. D. none of the above