Evolución y genética
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David P. Barash, Ph.D. and Judith Eve Lipton, M.D.
Eyes most likely evolved from simple to complex through a gradual series of tiny steps. Piecing together the sequence of eye evolution is challenging, and we don't know the sequence of steps that led to every modern eye. But we do know that modern animal eyes come in many varieties, spanning a continuum from the simplest to the most complex.