Dinosaurs were reptiles that lived

Dinosaurs were reptiles that lived during a period of earth’s history called the Mesozoic Era, which is also known as the Age of Reptiles. The first dinosaurs appeared more than 200 million years ago. For many millions of years, they dominated the land with their huge size and strength. Then about 65 million years ago, they died out rather suddenly, never to re-emerge.
The word “dinosauras” comes from two Greek words meaning “terrible lizard”. Dinosaurs were not lizards, but their appearance could be truly terrifying. The biggest ones weighed more than ten times as much as a mature elephant and nearly equalled the size of most modern-day whales. The famous kinds of dinosaurs, including the brontosaur and tyrannosaurus rex, reached 80 to 90 feet in length. Not all dinosaurs were giant, however, some were actually not larger than a chicken.
Scientists still do not know what caused dinosaurs to disappear. One theory involves a change of the earth’s climate. It is believed that temperatures dropped significantly towards the end of the Cretaceous protection, it is possible that the climate became too chilly for dinosaurs. In contrast, other species having protection, such as the mammals and birds, were able to survive.

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恐龙是生活在地球历史上称为中生代时期，这也被称为是爬行动物时代期间的爬行动物。第一恐龙出现了 2 亿多年前。许多数百万年来，他们占主导地位的土地以其巨大的规模和实力。然后大约 6500 万多年前，他们为之捐躯相当突然，永远不会重新出现。"Dinosauras"一词来自于两个希腊字，意思"可怕的蜥蜴"。恐龙不是蜥蜴，但它们的外观可能是真可怕。最大的重超过十倍于作为一只成熟的大象，几乎等于大多数现代鲸鱼的大小。著名种类的恐龙，包括 brontosaur 和霸王龙达到 80 到 90 英尺的长度。并不是所有的恐龙是巨人，然而，一些实际上不大于一只鸡。科学家仍然不知道是什么导致恐龙消失。一种理论涉及到地球的气候变化。据说气温显著下降接近尾声的白垩系的保护时，它是可能的气候变得太冷了恐龙。与此相反的是，有保护，如哺乳动物和鸟类，其他物种得以生存。

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恐龙生活的时期称为地球历史的中生代爬行动物，它也被称为爬行动物时代。第一个恐龙出现在200000000多年前。数百万年后，他们控制了土地由于其庞大的规模和实力。大约65000000年前，他们都死了，很突然，没有再次出现
。单词“dinosauras”来自两个希腊字意思是“恐怖的蜥蜴”。恐龙不是蜥蜴，但它们的外观可能是真正可怕的。最大的重量超过十倍，作为一个成熟的大象几乎等于最现代的鲸鱼的大小。著名的恐龙种类，包括雷龙和暴龙雷克斯，长度达到80到90英尺。并不是所有的恐龙都是巨大的，然而，有些人却不大于鸡。
科学家还不知道造成恐龙消失。一种理论是改变地球的气候。据认为，气温下降显着，白垩纪的保护期的结束，它是可能的，气候变得寒冷的恐龙。在对比，其他物种的保护，如哺乳动物和鸟类，也能够生存。