The Mesozoic Era was a time of many different creatures, especially dinosaurs, but they weren't there the whole time. Much of the land was underwater, which is marked off by a layer called the K-T boundary. When a meteor around ten kilometers wide hit the Earth, though, it displaced a lot of the water and land. All of the displacement as well as the debris coming off of the meteor buried most of the animals, not leaving much. A few of the smaller animals luckily survived the day the Mesozoic died, which left a promising future millions of years later for us.
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