Dictionary of Human Evolution and Biology

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Enamel ridges visible on teeth that represent 6-11 day microscopic increments of enamel laid down as teeth are formed; see stria of Retzius. Comparative studies have shown that australopithecines developed nearly twice as fast as modern humans, or about the same rate as that seen in apes, and that Homo neanderthalensis developed at about the same rate as Homo heidelbergensis; these species would have taken only about 15 years to reach adulthood, if rates of dental development reflect overall growth velocities.

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