The Chernobyl nuclear accident about 30 years ago
A) resulted in only five deaths and the loss of less than two square miles of land.
B) spread large amounts of deadly radiation over thousands of square miles.
C) avoided a complete core meltdown because of heroic intervention by two men who later died from radiation exposure.
D) was cleaned up and the nuclear reactor rebuilt in 1994 and has been free of problems since then.
Question 2
Despite the loss of grasses in African savannahs resulting from competition from the invasive Sodom apple, elephants may help restore savannah communities because
A) their dung helps fertilize savannah plants.
B) they no longer feed on savannah grasses.
C) they eat the Sodom apple preferentially, which is toxic to most other species.
D) they uproot Sodom apples as they seek the grasses they prefer.
Distribution of glaciers in North America (a) in the late twentieth century, and (b) 18,000 years ag
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