The primary source of water vapor and carbon dioxide for Earth's early atmosphere was most likely ____
A) photosynthesis
B) ozone reactions
C) outgassing
D) nitrogen chemical reactions
C
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The feudal system in early medieval Europe was characterized by
A) rigid, rurally oriented forms of economic and social organization. B) highly developed and widely distributed urban areas. C) a general lack of warfare. D) strong central governments that ruled large areas.
Which of the following is associated with botulism poisoning?
A) improper functioning of the acetylcholine receptor B) improper release of the acetylcholine messenger C) improper synthesis of acetylcholine D) improper synthesis of the acetylcholine messenger
As ice retreats by melting back, the rock debris carried by the glacier is deposited to form a relatively thin layer of till called a(n) ________.
A. ground moraine B. drumlin C. esker D. end moraine E. erratic
This instrument works on essentially the same principles as echo sounder but can penetrate the bottom of the sea floor and provides more information.
A. seismic reflection profiler B. sonar profiler C. multibeam sonar D. single beam sonar E. seismic refraction profiler