1. acquire
2. capacity
3. communication
4. context
5. evidence
6. gender
7. gesture
8. grin
9. head back
10. identical
11. in the dark
12. nature
13. nurture
14. prey
15. reassure
16. research
17. respond
18. structures
19. symbols
20. trail
21. two-faced
22. unique
23. upright
24. wiped out

Paragraph

Is it nature or nurture that allows human beings to acquire their unique qualities and capacities?  Research responds to this question by searching for evidence, one way or the other.  However, we’re still in the dark about which has the greatest effect.