GRE Text Completion: JiJing 1373-GRE填空机经1373题 - 824MI79FD7QBT9S_A

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