Final answer:
Reptiles do not have a four-chambered heart like birds and mammals. They have a three-chambered heart, which is more primitive than the heart of other reptiles. Additionally, crocodilians have a more advanced brain than other reptiles.
Step-by-step explanation:
Reptiles do not have a four-chambered heart like birds and mammals. They have a three-chambered heart, which is more primitive than the heart of other reptiles. Additionally, reptiles have a relatively small brain compared to mammals, but the crocodilian brain is more advanced than those of other reptiles. The eyes, ears, and nostrils of crocodilians are all located on the same "face" in a line one after the other.