Blood coming into the pulmonary capillaries is low in O2 and high in CO2.
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The three sides of the health triangle is Mental, Physical and Social
When a factory is running or when driving a car that gives off carbon dioxide and that pollutes the air.
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Earth's axis always points in the same direction. Because of this, the part of Earth that receives the most direct rays from the Sun changes as the Earth travels around the Sun. At the equinox, the Sun's rays shine most directly on the equator, and the Northern and Southern Hemispheres get the same amount of Sunlight.
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