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The retinas in the eyes of humans and birds have cone cells that absorb light of differentwavelengths.A scientist recorded the absorption of light of different wavelengths by different types of humancone cells. Her results are shown in Figure 1. Each curve shows the absorption of light by onetype of cone cell.Human colour vision has been explained by the trichromatic theory, meaning that it is based onthree colours.(a) Explain how the evidence from Figure 1 supports this theory.

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