Evolutionary Regression in Gravity

A lot has been said about the excitement, realism, and beauty of Alfonso Cuaron's Gravity. Most will agree that it is a fun experience but I must disagree with some critics such as David Denby from The New Yorker who claim that, though good, it is "not a film of ideas, like Kubrick's techno-mystical 2001." While the ideas of the film may take a back seat to the adventure, I believe there is an interesting commentary on humanity running throughout in the form of symbolism. 

SPOILER ALERT: This analysis covers major plot points of the film and should not be read before watching.