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What is the primary concern of the subfield of astronomy known as astrobiology?
Mandatory Helmets
Laws or regulations requiring the wearing of helmets for certain activities, such as bicycling or motorcycle riding, to reduce the risk of head injuries.
Firearms
Weapons that launch one or more projectiles at high velocity through the confined burning of a propellant.
Immunizations
The method of providing immunity or resistance to infectious diseases in individuals, usually through the application of vaccinations.
Staircase
A set or series of steps and platforms that allow for the upward or downward passage between different levels of a building or structure.
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