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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
- 19. When shopping, some people use brand names to help them decide what to buy.Other people go only by price. Which do you prefer? 45
- q4 80
- q4 75
- q3 70
21 in 30
Not well organized.