Fish live in water and their eyes are adapted to see in their underwater environment, just as human eyes are adapted to see in air. While humans cannot see air, fish cannot see the air either, but they can see the water in which they live. Water has a different refractive index than air, which affects how light travels and is perceived by the eyes. Additionally, water absorbs different colors of light more efficiently than air, which affects the way objects and colors appear underwater. Therefore, fish have evolved specialized eyes that allow them to see in their underwater environment and navigate their surroundings, just as humans have evolved specialized eyes to see in the air and navigate their environment.
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