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In pulmonary circulation, blood is pumped to the lungs by the:
Earth's Atmosphere
The layer of gases surrounding the Earth, essential for life, and protecting it from harmful solar radiation.
Fossil Fuels
Natural fuels such as coal, oil, and natural gas, formed from the decomposed remains of ancient plants and animals, used for energy.
Minerals
Naturally occurring, inorganic solids with a definite chemical composition and a crystalline structure found in the earth.
Earth Layers
The division of the interior of Earth into layers, including the crust, mantle, outer core, and inner core, based on chemical and physical properties.
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