Describe the hand of non-hadrosaurid iguanodontians and how it differs from the hands of hadrosaurids.
a) Non-hadrosaurid iguanodontians had more fingers and longer claws.
b) Non-hadrosaurid iguanodontians had a single, strong finger.
c) Hadrosaurids had opposable thumbs, unlike iguanodontians.
d) Hadrosaurids and iguanodontians had nearly identical hands.
