Fact 1: Birds evolved from a group of bipedal dinosaurs called theropods.

Fact 2: Feathers are highly probable in the advanced bird-like theropods.

Given the two facts above, answer the question "What are highly probable in the evolution of a group of bipedal dinosaurs?" with the following options: 
- group activities
 - heat energy
 - lack of teeth
 - animals
 - high altitidues
 - mammals
 - fur and fat
 - feathers


 

        feathers 