What were the advantages and disadvantages of an Iguanodon?

Answer 1

Like any organism, Iguanodon had far too many adaptations to count (considering even things such as a heartbeat or an eyeball are adaptations). One of its unique adaptations was a large, sharp claw on each thumb, which they may have used to defend themselves. They generally walked on four legs, but they could run on two legs, or stand on two legs so that they could get a better view of their surroundings and spot predators. They were plant eaters, but vegetation is hard to digest. One of their biggest adaptations was their ability to chew. Before that, plant eating dinosaurs simply swallowed their food, but chewing allowed Iguanodon to digest their food more thoroughly, and cheeks kept the food in their mouth, instead of falling out the sides.

A disadvantage that Iguanodon had was that it was an herbivore and therefor had predators.