Why are birds considered reptiles in an evolutionary classification system? (a) Feathers evolved from scales. (b) Birds are more similar to reptiles than was previously thought. (c) Birds are...

Why are birds considered reptiles in an evolutionary classification system?

(a) Feathers evolved from scales.

(b) Birds are more similar to reptiles than was previously thought.

(c) Birds are descended from the last common ancestor of all reptiles.

(d) Birds share certain similarities with crocodiles.