An environmental or political feature that hinders migration is
A) a visa.
B) a pull factor.
C) a push factor.
D) an intervening obstacle.
E) both a pull and push factor.
Answer: D
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Even if a country has banned the use of DDT, the pesticide can still enter the country as it can be carried by vectors such as wind.
Answer the following statement true (T) or false (F)
The block of rock above an inclined fault plane is called the ________
A) footwall B) hanging-wall C) strike-wall D) dipwall
What impact does the North American Free Trade Agreement have on relations between countries in North America?
A) NAFTA regulates and enforces protections for workers to ensure that they have safe working environments and fair wages. B) NAFTA eliminates tariffs and trade restrictions, facilitating export and import between countries in North America. C) NAFTA sets up regulations limiting industrial pollution in all three countries, ensuring the costs of manufacturing are similar in each country. D) NAFTA eliminates trade restrictions on products from embargoed countries.
The exoskeletons of marine microorganisms provide a valuable clue of past climatic conditions
Indicate whether the statement is true or false