Final answer:
The claim that Ornithopod dinosaurs had mammal-like feet is false as they had bird-like pelvises but did not evolve into birds, which came from "lizard-hipped" saurischian dinosaurs. Mammalian feet evolved separately in the mammal lineage from cynodont ancestors.
Step-by-step explanation:
The statement regarding Ornithopod dinosaurs having mammal-like feet is false. Ornithopods were a group of dinosaurs known for their bird-like pelvis design, denoted as Ornithischia, which means "bird-hipped". This description might lead to some confusion, but it is important to clarify that birds actually evolved from the saurischian, or "lizard-hipped" dinosaurs, not the bird-hipped ones. Ornithopods did not have mammalian feet; they had hind limbs that were adapted for bipedal locomotion, similar to what we see in many bipedal dinosaurs.
Comparing the evolutionary lineage of dinosaurs and mammals, we note that mammals evolved from cynodonts, a group of mammal-like therapsids, not dinosaurs. There were indeed dinosaurs that walked on two legs (bipedal) and had long tails to balance their long necks, but their feet were not similar to those of mammals. Birds, the descendants of theropod dinosaurs, developed their own unique foot structures through a long evolutionary process separate from that of mammals. Therefore, the assertion that Ornithopod dinosaurs had mammal-like feet does not align with the paleontological evidence we have today.