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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 great majority of organisms that use bioluminescence are found deep in the oceans depths. This ability to produce light serves a variety of functions. Organisms may use it to do anything from escape their predators
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This speaking topic by users
Post dates | Users | rates | Contents |
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2014-04-14 | Ekhlass1980 | 80.00 | Check this speaking |
2013-11-08 | Pinky123 | 85.00 | Check this speaking |
2016-03-03 | saramhl | 90.00 | Check this speaking |
2014-04-14 | Ekhlass1980 | 80.00 | Check this speaking |
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- http://www.testbig.com/toefl-speaking/q513 85
- do you prefer to learn on your own or learn with a teacher? use details and examples to support your explanation. 80
- Describe a wonderful experience that you shared with a family member, friend, or group. Choose one and explain why the experience was important or what you learned. 80
- What is your favorite style of clothing? Describe it and explain why it is your favorite. 65
- Your friend wants to lose weight by the beginning of the summer season. What advice would you give your friend who wants to shed some unwanted pounds? 80
26 in 30
The second example is short.