Cladistics is the branch of science that illustrates a. evolutionary history through the use of a branching tree. b. evolutionary history through the endosymbiotic theory. c. evolutionary history through radiometric dating. d. evolutionary history through the investigation of fossil evidence.

The correct answer would be A.

Cladistics studies evolutionary relationships by grouping organisms according to shared derived characteristics, just as a Branching Tree shows

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  eukaryotic cells may arise from sexual reproductions, resulting in more genetic variation  i would say that is the answer