A zygote fails to undergo mitosis because of a mismatched numbers of chromosomes. This is an example of
A. hybrid sterility.
B. zygote mortality.
C. prezygotic isolation.
D. temporal isolation.
E. allopatric speciation.
Ans: B. zygote mortality.
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a. tracheal tubes b. lungs c. gills d. skin e. nasal passages
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What was most key in the transition of fish into amphibians?
A. fins only B. both lungs and limbs C. limbs only D. lungs only E. both lungs and fins