The most recent glacial stage of the Pleistocene in North America was the ________
A) Nebraskan
B) Illinoian
C) Wisconsin
D) Kansan
E) Mindel
Answer: C
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Birds are ____________; they generate and regulate metabolic heat to maintain a constant internal temperature. Fill in the blank(s) with the appropriate word(s)
Hot spots are recorded by
A) extensive earthquake hazards B) mantle rock exposed at the Earth's surface C) rock from the outer mantle included in volcanic rocks D) a sequence of volcanic centers younging toward the hot spot
Chlorophyll absorbs only the ________ and ________ wavelengths for photochemical operations
A) orange-red; green-yellow B) violet-blue; green-yellow C) orange-red; violet-blue D) yellow-red; violet-green
In human-dominated ecosystems, which of the following features is often lacking?
A) the presence of positive feedback systems B) an ecosystem's ability to grow sufficient food C) the presence of sufficient human infrastructure D) homeostatic regulation E) drought resistant regulation