What on a bird, besides it's feet, is chemically similar to scales?
a. beak
b. feathers
c. wings

besides bird's feet, Feathers are chemically similar to scales.

Explanation:

Even though Both Beaks and feathers are composed in their majority from keratin, a protein. They are differentiated by their functionality in a bird's body. Beaks are made to feed, attack, defend, and execute maintenance functions. While feathers are made to protect the dermis from temperature, sun, and other external elements as well as Scales. But the keratin factor that makes them similar is the alpha and beta keratin composition both have.

air

in a tire you fill a tire with air

then a couple days later you check the air pressure in the tire

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