Do crocodiles and sharks give indication of how dinosaurs died?

Question

i.e. that it might have been some airborne infection or disruption on land that didn't effect the water?

Answer 1

Well, most scientists believe an asteroid of 6-miles long destroy most of the living things on earth of that time. Not only did it killed the land dwellers but also the aquatics.

Answer 2

There were dinosaurs that lived in the water. I've heard that there was more oxygen in the air when the dinosaurs lived and they couldn't live in today's atmosphere or at least the biggest ones couldn't.