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| Description: The decline in the average age of menarche from 1845 to 1969 is shown, based on data from Tanner (1973) and Ljung, Bergsten-Brucefors, & Lindgren (1974). Picture Stats: Views: 388 Filesize: 143.79kB Height: 733 Width: 833 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=25682 |