Question

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based on the \blues\ section of \the many colors of birds,\ what is keratin?
it determines the coloration of bird beaks.
keratin is a pigment that makes things appear blue.
keratin is a chemical found in food birds eat.
it is a protein found in living things.

Explanation:

Keratin is a well - known protein found in living organisms such as birds (in feathers, beaks etc.), humans (in hair, nails etc.). It is not a pigment for blue color, not a chemical in bird food, and while it is in beaks, it doesn't solely determine beak coloration.

Answer:

It is a protein found in living things.