1. Prehistory

2. Prehistory is the longest period of our past. It began about 2 million years ago, and ended with the invention of writing. 3. The first humans lived in tribes. 4. They lived in caves and painted the walls with pictures of animals. 5. They discovered fire. 6. They hunted animals... 7. ...for food 8. ...and for their skins. 9. ...and for their skins. 10. ...and for their skins. 11. They caught fish... 12. ...and gathered plants. 13. They made simple tools... 14. ...and weapons... Arrow heads Axes Spears 15. ...using stone, wood and bones.