Birds evolved from a group of bipedal dinosaurs called theropods, and feathers are highly probable in the advanced bird-like theropods. Given these facts, what are highly probable in the evolution of a group of bipedal dinosaurs among the following options:
- group activities
 - heat energy
 - lack of teeth
 - animals
 - high altitidues
 - mammals
 - fur and fat
 - feathers


 

        feathers 