Based on fossil evidence, scientists concluded that whales evolved from hoofed mammalian ancestors that lived on land. New evidence confirms this and suggests that among the hoofed mammals, the hippopotamus is the closest living relative of whales. Which of the following was the most likely source of this new evidence?
a:Comparisons of lifespans
b:Comparison of gene sequences
C: Mapping of geographic distributions
Answers: 2
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