“A pandemic is an epidemic of an infectious disease that has spread across a large region, for instance multiple continents or worldwide, affecting a substantial number of individuals. A widespread endemic disease with a stable number of infected individuals is not a pandemic. Widespread endemic diseases with a stable number of infected individuals such as recurrences of seasonal influenza are generally excluded as they occur …

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Homeostasis is the maintenance of a constant internal environment in the body. This is achieved by various mechanisms that keep the body’s internal conditions within a normal range. The body’s internal environment includes factors such as temperature, pH, and concentrations of dissolved gases and nutrients.