Final answer:
Iguanodon was named for its teeth that resembled those of an iguana, not for its skull or limbs, reflecting its herbivorous lifestyle from the Mesozoic era.
Step-by-step explanation:
The Iguanodon, a genus of ornithopod dinosaurs, which existed approximately during the late Jurassic and early Cretaceous periods, had a name derived from its distinctive features that resembled those of an iguana. Specifically, it was named for its teeth, which resembled those of an iguana. These teeth played a key role in its ability to process vegetation, as the Iguanodon was an herbivorous dinosaur. While there may be superficial similarities such as its teeth, the overall physiology of the Iguanodon was quite different from modern iguanas, particularly with respect to its size, with the Iguanodon being one of the largest dinosaurs of its time.
Regarding the other options presented, the Iguanodon's skull and limbs were distinct from those of modern iguanas. Instead, it had characteristics more in line with what is commonly seen in dinosaur fossils, including its bipedal stance and a bulkier body framework, reflecting its adaptation to its environment during the Mesozoic era.