They absorbed all the human who were driving them during the nuclear apocalypse and gained their features and intelligence. Then, they killed all the remaining humans as revenge for using them as modes of transportation for so long. They also never built anything, because they don't have hands, they just used the buildings left behind by the humans.
Explanation: Evolutionary spare change. The Cars' ancestors had need of teeth in the past, but their species has since changed, and they just haven't gotten around to evolving away these redundant parts. Similarly, people have things like wisdom teeth, and appendixes, and those brain bits that tells you exactly how you could dispose of the body of that person who disagreed with you on the internet.
Redundant means repetitive. The word you are looking for is vestigial. A vestigial organ is an organ that no longer serves a purpose within that organism's body.
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