Interesting... We need more oxygen than reptiles because we are 4 to 6 times less efficient in turning food to energy [0] [0]http://www.sciencemag.org/news/200

Interesting... We need more oxygen than reptiles because we are 4 to 6 times less efficient in turning food to energy [0] [0]http://www.sciencemag.org/news/2005/09/breathing-easier-jurassic http://www.sciencemag.org/news/2005/09/breathing-easier-jura...