Birds evolved from a group of bipedal dinosaurs called theropods.
Feathers are highly probable in the advanced bird-like theropods.
Feathers are highly probable in the evolution of a group of bipedal dinosaurs.
What are highly probable in the evolution of a group of bipedal dinosaurs?
Options:
(a) group activities
(b) heat energy
(c) lack of teeth
(d) animals
(e) high altitidues
(f) mammals
(g) fur and fat
(h) feathers