When did the ice-free corridor open in North America, allowing a path for human migration from Asia?
A) 12,500 years ago
B) 9,000 years ago
C) 100,000 years ago
D) 7,500 years ago
Answer: A
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When the algae in coral reefs die off due to environmental stresses, the coral subsequently dies because of lack of food. This process is referred to as
a. coral acidification b. algal blooming c. erosion d. coral bleaching e. parasitism
The Great Lakes of the United States resulted from repeated glacial advances and retreats which enlarged and deepened stream valleys to form the basins of the future lakes
Indicate whether the statement is true or false
What approach to control pollution is exemplified by the Clean Air Act?
taxation consumer choice subsidies command-and-control
Ingestion of ____________, which has been mistaken for food, can lead to the deaths of sea birds. Fill in the blank(s) with the appropriate word(s)