The biological species concept of Ernst Mayr cannot be applied to
A. sympatric organisms.
B. allopatric organisms.
C. eukaryotic organisms.
D. prokaryotic organisms.
E. asexually-reproducing organisms.
E. asexually-reproducing organisms.
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Activities associated with the parasympathetic division of the autonomic nervous system include
A. "fight-or-flight" response. B. increased heart rate. C. release of epinephrine only. D. release of both acetylcholine and epinephrine. E. resting and digesting.
Which chemicals are natural pain suppressors?
a. substance P b. bradykinins c. prostaglandins d. histamine e. endorphins
Which species lives in “disturbed habitats”?
a. fish b. deer c. insects d. humans e. birds
Nutrients that encourage the growth of beneficial microbes in the intestines are called ________.
Fill in the blank(s) with the appropriate word(s).