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   ocr: forward, while a corkscrew-shaped ammonite probably would have floated in the water, feeding on passing plankton or other small organisms. Spear-shaped ammonites may have changed the way they swam as they grew. Fossils of am- monites are found all over the world. Because different species of ammonites live during different time periods, scientists can use these animals to determine the relative age of the rocks in which their fossils are found (such fossils are called "index 213