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INTRODUCTION The composition of unpolluted air is unknown to us. Humans have lived on the planet thousands of years and influenced the composition of the air through their…

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Atmosphere OZON GREENHOUSE GAS EFFECT Atmosphere The surrounding air of the Earth Lithosphere METEOROLOGY GEOLOGY Biosphere Atmosphere ASTRONOMY Hydrosphere OCEANOGRAPHY…

Slide 1 Concept 42.5: Gas exchange occurs across specialized respiratory surfaces page 915 Gas exchange supplies O 2 for cellular respiration and disposes of CO 2 © 2011…