Biology The Essentials
Quiz 13: Evidence of Evolution
Dinosaurs Lived During the Paleozoic Era
Dinosaurs lived during the Paleozoic era.
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If you were looking for a time line of Earth's history,you would need one spanning about 4.6 billion years.
The abundant presence of ammonite fossils in a large area indicates that the area was once part of an ocean.
The fossil record is often incomplete,in part because scientists will never be able to discover some of the fossils that are buried deep in the earth and in part because some living things fossilize more readily than others.
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