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Why did dinosaurs become extinct but not other animals?
It is believed that due to the combination of slow incubation and the considerable resources needed to reach adult size, the dinosaurs would have been at a distinct disadvantage compared to other animals that survived the asteroid that struck Earth 66 million years ago.
Why did some dinosaurs survive?
Many scientists now suspect other factors were involved, from increased volcanic activity to a changing climate. Either way, some 70 percent of life on Earth perished, and an asteroid impact almost surely played a role. Scientists recently analyzed dinosaur bones found in the Ojo Alamo Sandstone in the San Juan Basin.
What really happened to dinosaurs?
Sixty-six million years ago, an asteroid struck eastern Mexico and wiped out the dinosaurs.
Why did Ocean dinosaurs go extinct?
They were wiped out by the same asteroid impact on the Yucatan peninsula in Mexico at the end of the creatatious epoch 66 million years ago. But they probably died out due to the ejecta from the asteroid impact blocking out the sun, and destroying the ecosystem of which they were the top.
Why did the asteroid killed the dinosaurs?
As originally proposed in 1980 by a team of scientists led by Luis Alvarez and his son Walter, it is now generally thought that the K–Pg extinction was caused by the impact of a massive comet or asteroid 10 to 15 km (6 to 9 mi) wide, 66 million years ago, which devastated the global environment, mainly through a …
Why did sharks almost go extinct?
The event may have wiped out nearly 90 per cent of sharks at the time. Many sharks are currently threatened with extinction as a result of human activities, including overfishing, plastic pollution and illegal shark finning.
How did crocodiles survive extinction?
Crocodiles survived the asteroid strike that wiped out the dinosaurs thanks to their ‘versatile’ and ‘efficient’ body shape, that allowed them to cope with the enormous environmental changes triggered by the impact, according to new research. Crocodiles can thrive in or out of water and live in complete darkness.
How did humans appear on Earth?
The first human ancestors appeared between five million and seven million years ago, probably when some apelike creatures in Africa began to walk habitually on two legs. They were flaking crude stone tools by 2.5 million years ago. Then some of them spread from Africa into Asia and Europe after two million years ago.