Which cells are part of the vertebrate peripheral nervous system?
a. afferent neurons
b. motor neurons
c. efferent neurons
d. afferent and efferent neurons
e. afferent, motor and efferent neurons
E
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Why would migration to an island by a single pair of birds be likely to lead to adaptive radiation in
their descendants?
What will be an ideal response?Gene sequences that evolve at a constant rate can be used to
a. index the time of divergence between two species. d. index the number of extinct species within a lineage. b. calculate speciation rates across lineages. e. calculate extinction rates across lineages. c. calculate speciation rates within different lineages.
In transcription,
a. several RNA molecules are made from the same DNA molecule. b. a promoter sequence is needed. c. DNA produces messenger RNA. d. a specific enzyme called RNA polymerase is required. e. all of these occur.
The number of species within a community is usually greatest when
A) no disturbance occurs. B) a low frequency of disturbance occurs. C) an intermediate frequency of disturbance occurs. D) a high rate of disturbance occurs.