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.
A
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The main route of transmission of the poliovirus is ________.
A. body contact B. respiratory secretions C. food and water D. fomites
The part of the neuron that is a single, long extension with a branching tip, that conducts impulses to a muscle or another neuron is the
A. synapse. B. cell body. C. axon. D. dendrite. E. node of Ranvier.
When pH levels in the blood get too low, chemical buffers are released that return blood pH back to normal levels
This is an example of ___.
a. negative feedback b. positive feedback c. ectothermal reactions d. sensory perception e. endothermal reactions
The ultimate goal of the male reproductive system is to
A) ensure that sperm is produced at the correct time, coinciding with ovulation. B) deliver sperm into the female's reproductive system. C) produce testosterone to influence gender development. D) produce large numbers of sperm. E) maintain the homeostatic condition of the male's body.