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"Talk about Backbone" PPT
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"Laboratory Preparation and Properties of Oxygen" Air Around Us PPT Courseware 6
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"Climate of the World" Weather and Climate PPT Courseware
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"Photosynthesis absorbs carbon dioxide and releases oxygen" Carbon-oxygen balance in green plants and biosphere PPT courseware 6
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"Photosynthesis absorbs carbon dioxide and releases oxygen" Carbon-oxygen balance in green plants and biosphere PPT courseware 2
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"Laboratory Preparation and Properties of Oxygen" Air Around Us PPT Courseware 3
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"Weather Calendar" weather PPT courseware
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