Sensory evolution is an amazing phenomenon in the animal kingdom, and now a new study has discovered how fish evolved to breathe air. Scientists at the University of Washington have discovered that a gene called cytochrome P450 2C9 (CYP2C9) was key in the evolution of fish to breathe air. This gene is responsible for the production of an enzyme that helps convert oxygen from the water to the air, allowing the fish to survive outside of water for extended periods of time. The study sheds light on the incredible process of sensory evolution, and how species can adapt to their changing environment.

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source: Phys.org