Sorry, no online dictionaries contain the exact phrase mutual aid a factor of evolution.

Reverse dictionary results:
1. need
 2. cooperation
3. logrolling
4. reciprocity
5. solidarity
6. support
7. phylogeny
8. interchange
9. interchanging
10. reaction
 11. temperament
12. blight
13. sliding scale
14. turn
15. blighted
16. guaranty
17. outgrowth
18. positive reinforcer
19. positive reinforcing stimulus
20. combinative
 21. cam
22. run
23. bead
24. move
25. rally
26. sketch
27. trot
28. change
29. changing
30. course
 31. barter
32. discount
33. front
34. have
35. hold
36. monitor
37. pass
38. passed
39. release
40. standoff

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You can look up the words in the phrase individually using these links:   mutual ?   aid ?   a ?   factor ?   of ?   evolution ?
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