Which of the following chemicals plays a part in a man's erection?
a. carbon dioxide
b. carbon monoxide
c. nitric oxide
d. phosphoric acid
e. carbonic acid
C
Biology & Microbiology
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The process by which water is "pulled" up through the xylem columns of plants as it evaporates out of the leaves is called
A. respiration. B. transpiration. C. osmosis. D. anhydration. E. stomatization.
Biology & Microbiology
Define sensory adaptation
What will be an ideal response?
Biology & Microbiology
Approximately 65.5 million years ago the Earth experienced a permanent loss of major groups of organisms during an event called ________
a. speciation b. continental drift c. genetic equilibrium d. mass extinction e. directional selection
Biology & Microbiology
Which greenhouse gas can be generated in the guts of cattle?
a. carbon dioxide b. nitrous oxide c. oxygen d. chlorofluorocarbons e. methane
Biology & Microbiology