A sterile mule is produced by mating a horse and a donkey. From this observation you could conclude
A. that mules are a result of macroevolution.
B. that horses and donkeys are the same species.
C. the DNA sequences of horses and donkeys are more than 97% identical.
D. that horses and donkeys are different species.
E. increasing the number of mules in a population will affect the allele frequency in the next generation.
D. that horses and donkeys are different species.
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