Imagine you fart on the beach. No one notices.
You fart in a elevator: noticeable.
100 farts in an elevator: scary.
The meteor that hit the planet was so big that the 12 km thick atmosphere was not enough to dilute the plume of dust and flames. Instead, dust, smoke, gas and whatever did float above the atmosphere, because this stuff was hot and less dense. It took several years to settle down. The sky of the entire planet was obscured by a massive meteor fart cloud, poisoning animals and removing sunlight to plants.
Several years passed, with very little amount of plants and food.
All the big animals starved.
The small ones starved too. But before disappearing, few remaining small animals were saved by their size. Small size, less need for food, more chances to have a meal.
Then there was an era of rats ancestors and chicken ancestors dominating the planet. For a while.
Then food came back on the menu and animals could grow big again, and have big meals. Then some evolution and the few rats and chickens became hippos and horses and bears and elephants and eagles and so on.
Ok this is literally eli5 isn’t it?
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