Which of the following is the main agent used to keep hemoglobin in its reduced form?
A) ATP
B) FAD
C) glutathione
D) NADP+
C
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Clouds that are high and are always composed entirely of ice crystals are:
A) stratus. B) thunderheads. C) alto. D) cirrus. E) nimbus.
The field of urban planning has embraced the concept of "smart growth" to mitigate climate change. Which of the following would not an example of smart growth?
A. adding green space to planned communities B. adding bicycle paths to new, planned communities C. replacing grass with artificial grass made of plastic D. reducing distances between homes, stores, schools, and workplaces in new, planned communities
The site on the accompanying figure that would most likely form a rock that is glassy with no volcanic ash is
A) A.
B) B.
C) C.
D) D.
E) E.
Until about 5000 B.C. most people in the world lived by
A. working at McDonald's B. hunting and gathering C. farming D. serving in armies