Birds evolved from a group of bipedal dinosaurs called theropods.
Bird's feathers have evolved from reptile scales.
Feathers have evolved from reptile scales of bipedal dinosaurs called theropods.
what have evolved from reptile scales of bipedal dinosaurs called theropods

a: animals
b: fur
c: feathers
d: fur and fat
e: mammals
f: warm-blooded
g: hair
h: eyes