The trachea is maintained in an open position by:

a. the Adam's apple. c. surfactant.
b. the carina. d. cartilaginous C-rings.

d

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The normal hematocrit range for adult males is ______ percent

A) 4-10 B) 16-25 C) 37-47 D) 42-52

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Quarks may behave according to the ____ theory.

a. string b. quantum c. relativity d. electromagnetic

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