What type of speciation requires a geographic barrier?
A. sympatric speciation
B. allopatric speciation
C. Both sympatric and allopatric speciation require a geographic barrier.
D. Neither sympatric or allopatric speciation require a geographic barrier.
Answer: B
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The principal difference between simple and stratified epithelium is in the number of
a. cell layers. b. total cells. c. nuclei per cell. d. free surfaces. e. microvilli.
Ribosomes are a type of (apoenzyme/enzyme/ribozyme).
Fill in the blank(s) with the appropriate word(s).
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