Which of the following is always a part of
speciation?
a. behavioral isolation
b. temporal isolation
c. reproductive isolation
d. ecological isolation
e. mechanical isolation
C
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Consider conjugation in Escherichia coli. In which of the following matings would chromosomal genes be transferred most frequently?
A) F+ × F- B) F- × F- C) Hfr × F- D) Hfr × F+
Which of these worms are segmented?
A. annelids B. planarians C. roundworms D. flukes E. All worms are segmented
The most significant role played by pH buffers is to
A. prevent fluctuations in the acidity of solutions. B. increase the strength of acids and bases. C. keep pH low. D. limit major shifts in the amount of H+ and OH- in solution. E. prevent fluctuations in the salinity of solutions.
Shin splints occur from stress placed on the lower leg causing bones to split.
a. true b. false