This is Question 6 from EVO: Ten Questions Everyone Should Ask about Evolution.   If you like this free sample, how ’bout buying the DVD which contains all ten questions and  lots of extras.  You might also consider the EVO: Teachers Guide by Rodger Bybee and John Feldman.

If we form alliances with others we can do more than going it alone,” so says Richard Michod as he explains that cooperation is just as important a driver of evolutionary change as competition, which usually gets all the credit. EVO looks at examples of cooperation in everything from human cells to ants, hyenas and human society. Lynn Margulis introduces the Gaia idea and helps us see that we are all connected and part of a complex and robust system.