Reviewers' reports Reviewer 1: Juergen Brosius, University of Muenster This is a timely, captivating and clear presentation of yet another and highly significant testimony to the fact that in nature, we rarely encounter clear boundaries.
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The sentences
Whether or not there is an overall trend toward increasing complexity over the course of evolution of life, remains a legitimate subject of debate [ 19 - 22 ], but of course, even those researchers who advocate the existence of such a trend would not characterize it as an "innate tendency".