| 1 | We need to reduce our dependence on fossil fuels. | |
| 2 | The fossils of these animals have been buried for millions of years underground. | |
| 3 | There are various fossils in this natural history museum. | |
| 4 | Scientists study fossils to learn about the lives of ancient creatures. | |
| 5 | In this ancient forest, we saw many fossils from ancient times. |
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