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- Fossils are evidence of past life, such as bones, teeth, and footprints.
- The collection of fossils in the Earth's crust and their placement in chronological order is called the fossil record.
- Scientists study the fossil record to understand how life on Earth has changed over time.
What trend in the complexity of life over time is seen through the fossil record?
What were the oldest living things from 3.5 billion years ago like?
How long ago do humans appear in the fossil record? Is this recent? Explain.
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