Pheromones
a. are signaling molecules that are used for
olfactory communication between two
different species.
b. are only used by invertebrates.
c. require a vomeronasal organ to be detected.
d. are signaling molecules used for olfactory
communication between members of the
same species.
e. are all of these
D
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Which sequence of classification categories is in the proper order from least to most inclusive?
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