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Our Unique World
Atmosphere and Ocean
The Gases We Breathe
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activities adaptation adjustments advance ages animal apparently arranged atmosphere atoms beauty become beginning believe body brain breath bring brought build carbon dioxide carried cell chance chemical color combined comes complete create creature crust cytoplasm developed earth elements environment eternity evidence evolution exact existence facts genes give human hundred imagination immortal individual infinite insect instinct Intelligence knowledge known leaves less light living creature living things man's marvelous material matter means measure mechanism meet miles millions minds molecules nature necessary nitrogen ocean original oxygen perfect perhaps physical plants possible present produce protective race rays reach reasoning record result scientific seems sense separate space spirit stars substances temperature thousand tion tree true ultimately understanding universe vast vegetation wonderful