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| Description: During a 12-million-year period in the early Jurassic, the shells of oysters of the extinct genus Gryphaea became larger and flatter. Scientists have hypothesized that such a change was an adaptation to disruptive water currents.
Picture Stats: Views: 3687 Filesize: 66.19kB Height: 750 Width: 850 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=677 Keywords: Evolutionary changes in the shape of oyster shells. |