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Fig. 15-CO, p. 406

Fig. 15-CO, p. 406. Fig. 15-1, p. 408. Carbon dioxide. Oxygen. Relative concentration. 4.5. 3.5. 2.5. 1.5. 0.5. 0. Time (billions of years ago). Animals arise. Oxygen begins to accumulate in the atmosphere. Oxygen-producing cyano bacteria get their start.

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15 17b - PowerPoint PPT Presentation

Fig. 15-CO, p. 406