Across
- 3. this was the first life form on earth
- 5. having a steady crop of food led to this
- 8. waste product from plants helped other forms of life succeed on Earth
- 9. an animal that only eats plants
- 11. this climate event made rainfall for farming become unreliable
- 12. having no rules and laws, civilization could lead to this
- 13. the first civilization began in this area
- 14. an animal that only eats other animals
Down
- 1. beside controlling plants for farming what other life forms were humans able to control
- 2. the first plant that made farming possible
- 4. the other main river of Mesopotamia
- 6. one of the two main rivers of Mesopotamia
- 7. this invention helped bypass rainfall as a major need for farming
- 10. an animal that eats both plants and animals