I feel that dinosaurs were killed by a methane eruption. Methane dissipates eventually and the evidence would pretty much be gone. No one has shown a asteroid or some un earthly rock that hit that long ago. I'm really fond of the methane theory. That methane eruption happened world wide killing most dinosaurs and land animals. (why is it that crocs and air born dinosaurs were proved to live longer and not die out at same time?) Water living creatures wouldn't have been effected thus the ocean life seemed to remain alive.

So my answer is a methane eruption that wiped out the dinosaurs.

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