Dinosaurs once lived happily on the earth.But 65 million years ago,they suddenly died out.What happened to them?Some American scientists say it is because there were not e___male dinosaur

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Dinosaurs once lived happily on the earth.But 65 million years ago,they suddenly died out.What happened to them?Some American scientists say it is because there were not e___male dinosaur

Dinosaurs once lived happily on the earth.But 65 million years ago,they suddenly died out.What happened to them?Some American scientists say it is because there were not e___male dinosaur
Dinosaurs once lived happily on the earth.But 65 million years ago,they suddenly died out.
What happened to them?Some American scientists say it is because there were not e___male dinosaur

Dinosaurs once lived happily on the earth.But 65 million years ago,they suddenly died out.What happened to them?Some American scientists say it is because there were not e___male dinosaur
enough
囧,一些美国科学家说恐龙灭绝是因为没有足够多的雄性恐龙?