What is one characteristic of all major culture revolutions that have happened since the hunter-gatherer era? 

A)  shorter life spans 
B)  decreased resource consumption and pollution 
C)  improved living standards 
D)  decreased food supplies

All major cultural revolutions since the hunter-gatherer era have resulted in improved living standards for the people involved. Examples include the agricultural revolution, industrial revolution, and digital age revolution. Shorter life spans and decreased food supplies are often consequences of revolutionary changes rather than characteristics of the revolutions themselves. Decreased resource consumption and pollution may be goals of some revolutions, but this is not a universal characteristic.