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Speaking reference notes: This topic is refereed from another speaking topic, developed by user: Vanan
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Speakings by user Ekhlass1980
:
- Q3 70
- Q5 80
- 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
- Evolution in Action When an environment undergoes a dramatic change and no longer provides the conditions necessary for a species to survive, this species must change or face extinction. It has long been held that this change, referred to as evolution, ne 80
- q3 80
25 in 30
Great!