The Pleistocene began with major glacial advances as early as ____
a. 10 thousand years ago
b. 100 thousand years ago
c. 2.6 million years ago
d. 26 million years ago
e. 100 million years ago
c
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Which of the following exhibits primary succession?
A. a rock exposed by a retreating glacier B. an abandoned farm C. a clear-cut forest D. newly flooded land E. a recently burned forest
Parasitism occurs when one species feeds on another organism
Indicate whether the statement is true or false
What is the Gulf Stream?
A. the source of warm winds that blow from the ocean over the lands of Great Britain and Norway B. an ocean current that moves warm water from the Equator to the coast of Northern Europe C. a surface current D. all of the above
Pioneer farmers settling the grasslands of the American West often built houses of sod, while early settlers of the eastern forest built wooden structures like log cabins. This suggests that building materials
A) are strongly influenced by local resources.
B) are commonly imported over long distances because of local folk culture.
C) are chosen because of the diffusion of popular culture.
D) are a uniform feature of folk culture.
E) are elements of popular culture.