The wing of a bird and the arm of a human are examples of...

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The wing of a bird and the arm of a human are examples of ___________ structures.
The only source of new alleles in a species is ___________.
The word "theory" in theory of evolution is best replaced by ___________.
"Survival of the fittest," or the reproductive advantage in individual who inherit traits that help it adapt to a changing environment was something Darwin called ___________.
Two populations of crickets have stopped interbreeding over time, although they reside in the same geographic region. What is one possible explanation?
Allopatric speciation is to geography as ___________ speciation is to genetic change.
Genetic variation is accomplished by all but one of the following. Which one is it?
-The events of meiosis 1 -Crossing over -The events of meiosis 2

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