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  1. Sample Slide Random Slides From This PowerPoint Show The age of the dinosaurs lasted for about 165 million years. Then they all died out. When a group of animals die out we say that they became extinct.

  2. Many scientists think that 65 million years ago, a huge chunk of space rock smashed into Earth. They think it hit Earth so hard that it was like an explosion. Sample Slide Random Slides From This PowerPoint Show

  3. New kinds of plants and animals appear, do well for a time and then die out as even more new kinds appear. These changes in living things are all natural and have happened ever since life first began on Earth. Sample Slide This slow change of living things over time is called evolution. Without evolution, we wouldn’t be here! Random Slides From This PowerPoint Show

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