The physical level is the primary interface with the environment outside of the computer system.
Some people live there, learn there, work there, and play there. Through the air they breathe, the water they drink, the homes they live in, and the transportation they use to get to work and education, people interact with their physical environment. Our ability to live long, healthy lives—as well as that of our families and neighbors—can be impacted by our physical surroundings.
Healthy living depends on access to clean air and water. Increased rates of asthma and lung conditions, as well as an increased chance of dying young from heart or lung illness, are all linked to air pollution. Chemical, pesticide, or other contaminant-polluted water can lead to disease, infection, and higher cancer risk.
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