Hiv is the virus that causes aids. in the mid-1990s, researchers discovered an enzyme in hiv called protease. once the enzyme's structure was known, researchers began looking for drugs that would fit into the active site and block it. and this strategy for stopping hiv infections is currently successful, and is an example of what phenomenon

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