Ring species such as the greenish warbler complicate the biological species concept because (select all correct choices)
A. at least some of their populations are
reproductively isolated from one another but
can still exchange genetic material.
B. at least some of their populations overlap
spatially, but individuals in those populations
do not interbreed with one another.
C. individuals in at least some populations
interbreed with individuals from other species.
D. ring species comprise populations that are
in the process of allopatric speciation.
E. none of these
A
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A symptom of a transmissible spongiform encephalopathy (TSE) is:
a. degeneration of the digestive tract. b. progressive immune deficiency. c. degeneration of the brain and central nervous system. d. inflammation of the reproductive organs. e. influenza-like symptoms
Lichens represent a symbiotic association between a fungus and a plant
Indicate whether the statement is true or false
The shoulder joint where the humerus meets the pectoral girdle is an example of a
A) hinge joint. B) ligament. C) pivot joint. D) ball-and-socket joint.