Tell us about the dinosaurs

[The Skeptic]

It's slightly straying from the conversation but on topic with dinosaurs to say this; In astronomy we were having a lecture on the asteroid that caused extinction and gave rise to the age of the mammals via evolution, and some guy in the class said, "then why are there reptiles today" and the teacher didnt look like he knew what to say ( he's a physicist not a biologist and he's from Korea and there's a bit of a language block on his part, though his english is relatively fluent ) so I quipped that through natural selection the colder blooded life forms died out leaving those with warm blood or a feather covering like raptors to stay warm enough to survive.