Respiratory neurons from the dissected brainstem of a neonatal rodent can maintain rhythmic firing for ____ hours
a. 0.5
b. 1.0
c. 4.5
d. 6.0
e. 8.5
ANSWER: d
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A structure that gives the sponges their phylum name
is indicated by a. A. b. B. c. C. d. D. e. E.
The acid released in the stomach is
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