ROBERT CHASE / SCIENCE PHOTO LIBRARY ROBERT CHASE / SCIENCE PHOTO LIBRARY
Prehistoric sea. Illustration of a prehistoric sea during the Pliocene period (3.5 million years ago) based on fossils from North Carolina, USA (Waccamaw Foundation). Species shown include the Atlantic bonito (Sarda sarda, small fish), the Caribbean monk seal (Monachus tropicalis, lower right) and the short-fin mako shark (Isurus oxyrinchus, centre).
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