Bio 102 gleeson Based purely on our understanding of planet formation in this solar system, we would EXPECT earth’s atmosphere to have very high levels of , fairly low levels of , and extremely low (or even zero) levels of .

The development of simple stone tools by early hominids led to the ability to procure meat more efficiently. this in turn led to the change in diet that included larger amounts of protein. many scholars believe that this shift in diet was a significant part of how our ancient ancestors adapted so quickly to a varied set of environments, and thus were able to begin cultural development. this demonstrates the intimate connection between