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.

intermolecular forces are the forces between molecules or particles.

there are two kinds of van der waals forces: weak london dispersion forces and stronger dipole-dipole forces.

in molecule of water there are dipole-dipole forces between negatively charged oxygen from one molecule of water and positively charger hydrogen of another molecule of water.

hydrogen bond is an electrostatic attraction between two polar groups that occurs when a hydrogen atom (h), covalently bound to a highly electronegative atom such as flourine (f), oxygen (o) and nitrogen (n) atoms.