Circulatory systems on organisms originated in widely separated e

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Circulatory systems on organisms originated in widely separated epochs, according to the fossil record, and under a broad range of circumstances, the myriad forms they take attest to that ______ of origin.

A、mysteriousness
B、randomness
C、ambiguity
D、heterogeneity
E、indeterminacy
F、diversity

答案：D,F

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