One of the new distinguishing characteristics of the early dinosaurs over their ancestors was?

Question

It's one of these:

--That they all were bipedal

--The universal presence of body hair or feathers

--A posture and balance that distinguishes them from ancestral reptiles of the Triassic

--Large head ornamentation

--A brain with human-like qualities

Please only answer if you're positive. Thanks!

Answer 1

"A posture and balance..." is the only the only answer that works.

Answer 2

The answer is:  a posture and balance that distinguishes them from ancestral reptiles of the Triassic.  Dinosaurs, whether they be bipedal or quadripedal, held their bodies above the ground while walking and standing rather than pulling themselves along and/or letting their bodies rest on the ground when "standing."  Think of the difference between the way a rhinocerous holds itself up and the way an iguana holds itself up.  They also used their tails to balance themselves, holding their tails straight out behind them rather than ever letting them drag behind them on the ground.

Their posture is evidenced by the morphology of their hip bones and a few other bones.  For more information and some other sources, follow the link in the source section.

Answer 3

- they rode mopeds