Examine the diagram. A diagram with two bubbles and two arrows in the middle pointing opposite ways. The left bubble says, "The environment affects human behavior. Based on this diagram, which is the best explanation of why environmental problems are difficult to solve? The environmental problems are not caused by people. The environment is too complex for people to understand it. People change the environment in different ways, which causes human behavior to change. Humans are part of the environment, so they cannot have a large impact on the environment.

The answer you're looking for is washing your hands. "at this late date, we all expect our doctors to wash their hands before examining us or performing an operation in order to prevent the spread of infection. surprisingly, physicians did not begin to acknowledge the lifesaving power of this simple act until 1847.it was then that dr. semmelweis began exhorting his fellow physicians at the famed vienna general hospital (allgemeines krankenhaus) to wash up before examining women about to deliver babies. his plea was far more than aesthetic; it was a matter of life and death and to prevent a deadly malady known as “childbed” or puerperal (from the latin words for child and parent) fever."