Question

after destroying dinosaurs life why they not come again

Answer 1

because not even a single dinacore left then how can they produce their young one's...
LOGIC

Answer 2

Many years before the dinosaurs became extinct due to interruption of climate and geological changes for their food supply. That time all the dinosaurs that existed were set to death and none of them were left to reproduce its species. And even the last dinosaur was put to death before 65 millions years ago due to the worst hit of nature.
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