was it a herbivore, carnivore or omnivore?
Carnivore
Allosaurus
"Allosaurus" was a large bipedal predator.
how many years ago did the allosaurus exist? 155 to 145 million years ago which period was that? The late Jurassic period describe this creature's physical features It was a typical large theropod, having a massive skull on a short neck, a long, slightly sloping tail and reduced forelimbs.
wiki:1566120
Allosaurus [SEP] Introduction
Allosaurus () is a genus of carnivorous theropod dinosaur that lived 155 to 145 million years ago during the late Jurassic period (Kimmeridgian to late Tithonian). The name ""Allosaurus"" means "different lizard" alluding to its unique concave vertebrae (at the time of its discovery). It is derived from the Greek (') ("different, other") and (') ("lizard / generic reptile"). The first fossil remains that could definitively be ascribed to this genus were described in 1877 by paleontologist Othniel Charles Marsh. As one of the first well-known theropod dinosaurs, it has long attracted attention outside of paleontological circles. "Allosaurus" was a large bipedal predator.