Which of the following events would be considered a migration pull factor?
A) religious persecution
B) failed harvest
C) flooding of a river
D) opening of a new factory
E) civil war
Answer: D
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The __________ is moving southward, and the agrarian culture at the base of numerous West African countries is often plagued by drought and famine.
a. none of these b. manufacturing base c. Sahara Desert d. population of Bhutan e. climate
When T cells interact with an antigen, they differentiate into how many types?
A) 1 B) 2 C) 3 D) 4
Climate over the past 2 million years has
A) stayed the same. B) become progressively cooler. C) become progressively warmer. D) shifted between warm and cool periods.
What are the two main categories of metamorphic texture?
A) Heat and pressure B) Schistosity and dissolution C) Vesicular and pyroclastic D) Foliated and nonfoliated