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q3
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This speaking topic by users
| Post dates | Users | rates | Contents |
|---|---|---|---|
| 2014-12-05 | france79 | 80.00 | Check this speaking |
| 2016-01-24 | hudashti1 | 80.00 | Check this speaking |
| 2016-01-11 | hudashti1 | 80.00 | Check this speaking |
| 2015-12-27 | hudashti1 | 80.00 | Check this speaking |
| 2016-02-07 | hudashti1 | 80.00 | Check this speaking |
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Speakings by user Ekhlass1980
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- Bioluminescence Bioluminescence occurs when organisms convert chemical energy into visible light. This happens when a chemical reaction involving oxygen and two other molecules takes place. During this reaction, light of varying colors may be emitted. The 80
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23 in 30
Some hesitations.