What were two traits of early humans?

early humans began walking upright before they began making tools. A rapid increase in brain size occurred before early humans began using symbols to communicate. And all of these traits emerged before humans began domesticating plants and animals.

For example, early humans starting walking in upright way before they began constructing different tools. A rapid increase in brain size occurred before early humans began using a lot of techniques or symbols to communicate. And all of these traits appeared before humans began taming plants and animals.

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1. a

2. b

3. d

4. d

5. b

6. b

7.b

8. a

9. d

10. d