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Explain how natural selection can move a population beyond its initial range of variation.
Epidemiologist
A public health professional who investigates patterns and causes of diseases and injuries in humans.
Incubation Period
The time between exposure to a pathogen and the appearance of the first symptoms.
Infectious Disease
Diseases caused by pathogenic microorganisms, such as bacteria, viruses, parasites, or fungi, that can be spread directly or indirectly from one person to another.
Clinical Illness
A condition characterized by a set of symptoms and signs experienced by patients, requiring medical treatment and care.
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