Examlex
_________ macrophages engulf foreign particles that might be inhaled into the small sacs in the lungs.
CFCs
Chlorofluorocarbons, man-made chemical compounds once commonly used in refrigeration and aerosols, known to deplete the ozone layer.
Years
Units of time based on the period Earth takes to orbit around the Sun, approximately 365 or 366 days.
Cumulative CO₂ Emissions
The total amount of carbon dioxide released into the atmosphere over a specified period of time by human activities.
United States
A federal republic located primarily in North America, comprising 50 states, a federal district, and various territories, known for its significant impact on global culture, economy, and politics.
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