Maiasaura did both to get away from predators
Yes
Only for a minute or two. It's not their natural position.
same reason we walk or run on two legs that's the way they were made
Hadrosaurs and Iguanodonts are both known to have walked on four legs. However, they could stand, walk, or run on two legs when it was useful.
An ostrich is unable to fly, but it has two long, every strong legs on which it can run fast on.
Theropods only walked on two legs. Some types of small ornithopods were also completely bipedal.
No we do not have two legs we have none we walk with are arms.
Dinosaurs that walk on two legs are called "bipeds". The term applies to all animals that walk on two legs.
Yes. All dinosaurs were two legged to run fast and catch prey.
You run or walk with your legs. Your stomach is used to break down food. The two have different muscles to complete different tasks.
No!
A bear can walk on two legs but only for a few steps even up hill.