The answer is true. Naturally, species arrive and depart over protracted times. But what distinguishes a mass extinction is the fast disappearance of three-quarters of all species. Five mass extinctions have previously occurred on Earth, including the asteroid that wiped off dinosaurs and other animals 65 million years ago.
The last species mass extinction event on the world, which exterminated the dinosaurs 65,5 million years ago, was one of five that have previously occurred on the planet. According to experts, we are currently experiencing the sixth mass extinction. Climate change, a severe ice age, volcanoes, and the space rock that slammed into the Gulf of Mexico.
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