stone age

4. time before written records
6. any fact, object, document, or statement that gives a reason to believe or prove whether a claim is true or false
7. the set of surroundings, conditions, or influences in which a living organism or system exists
11. to change something—or to change yourself—so that it fits a new use, condition, or environment
13. anything made and used by humans
14. the shared set of beliefs, values, customs, behaviors, and traditions that characterize a group of people or society
15. lived by hunting small animals
17. scientists that study rock
18. composed of many interconnected or related parts rather than being simple or straightforward
19. the worldview holding that non-human organisms, landforms, and inanimate objects possess spiritual essences, souls, or agency
20. hardened remains or imprints

1. to move from one place, country, region, or system to another
2. suitable or fit to be relied on, dependable, and worthy of trust or belief
3. to live in, occupy, or fill a place with people, animals, or things
5. a system of interconnected lines, channels, people, or devices that cross, link, or communicate with one another
8. a sudden, radical, or complete change in a political system, society, industry, or physical motion
9. a person or a member of a group who has no fixed home and moves from place to place, usually seasonally or in search of food, water, pasture for animals, or work
10. to bring something to an end, or to form an opinion through reasoning
12. study of human life
16. study of how humans behave