Forty-eight-year-old carlos has noticed that he tires easily and often get headaches when doing computer work. he also needs to hold material with fine print at an arm's length to read it. most likely carlos is experiencing:

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