Unit One #1

3. the land bridge humans crossed to arrive in America
5. an order of mammals including monkeys, apes and humans distinguished by having hands, feet that are similar to hands, and forward-facing eyes
8. a change in normal weather conditions over a long period of time in a place
10. a woman who lived about 160,000 years ago who had enough daughters that her mitochondrial DNA survived and is found in all modern humans
11. the part of the skull enclosing the brain
14. ice that melts causing rising sea levels
16. the preserved remains, or traces of remains, of ancient organisms in rock
18. Latin for “wise human”, it is the species to which modern humans belong
20. something that can be used for a helpful purpose

1. human communication, consisting of words used in a structured and conventional way
2. the action of clearing a wide area of trees
4. when the environment is made dirty by harmful waste, gases and/or chemicals
6. one of a kind; unlike anything else
7. gases that keep heat from leaving the Earth like carbon dioxide and methane
9. the rising of the normal temperature of the earth
12. the practice of farming
13. knowledge When a large group of people share information, skills, or knowledge to learn from or build upon each other
15. ealy humans are believed to have crossed a land bridge over this sea when migrating out of Africa
17. movement from one place to another
19. a continent south of Europe and between the Atlantic and Indian Oceans
21. develop gradually, especially from a simple to a more complex form