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• 7A. Atoms – Encyclopedia Britannica©1992 Volume 14 Page 378-Energy from Atoms-Left Column.
• 7B. Atoms – Encyclopedia Britannica©1992 Volume 14 Page 339-Left Column First Paragraph.
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• 7D. Wikipedia -Molecular signaling -March 31, 2021 at 13:09 ( UTC ).
• 7E. Wikipedia – Conservation of Energy- 15 April 2021 , at 17:20 (UTC).