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