Did you know that some palontologists now believe that the Chicxulub asteroid impact wasn't the only thing that killed the Dinosaurs.

Around 65,000,000 years ago the supercontinent Panga was in the verge of violently breaking up. Not only was it causing massive earthquakes but it was also causing massive supervolcanoes.

Now those supervolcanoes were releasing massive amounts of soot and ash high into the atmosphere which in turn was blotting out the sun causing temperature drops. It was also causing acid rain.

Now that acid rain was poisoning the ground and plants which were poisoning the herbivorous Dinosaurs which were being eaten by the carnivorous Dinosaurs poisoning them.

Then the asteroid smashed into Earth.

So they were already on their way out before the asteroid hit so that was just the final nail in the coffin for them.

After the impact there were survivors of course. But like I said the plant eating Dinosaurs were being killed by the poisonous plants and the meat eaters from eating the dead bodies of the Dinosaurs and then the final few basically starved to death when the food ran out.