I think they would have been more like birds than reptiles, many being warm blooded and with feathers. I think we have reasonable evidence to support the idea of at least one mass extinction. With craters in Mexico supporting the ideas of a meteorite hitting the Earth at a similar time that they disappear from the fossil record.
I would guess that dinosaurs came in all different shapes and sizes, much like us! I think the evidence linking their extinction to a meteor hitting the earth is strong and makes sense
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