There is a deeply rooted supposition in evolutionary biology, that you can't go home again: Once an organism has evolved specialized traits, it can't return to the lifestyle of its ancestors. There's even a name for this pervasive idea. Dollo's law states that evolution is unidirectional and irreversible. But this "law" is not universally accepted and is the topic of heated debate among biologists. Now a research team led by two University of Michigan ...
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