用英语简单概括(100字以内)下述文字：地球上生命的起源 没有人确切知道地球是怎样开始形成的

No one knows how the earth began to form, because in the long long ago the earth was formed. However, a generally accepted theory is; The universe originated in a big bang, the big bang speak material...Hundreds of after ten thousand, the water began to appear on the surface of the tiny plants. They multiply makes early ocean filled with oxygen, for the early shellfish and further create conditions for the growth of other kinds of fish. Then, green plants began to appear on land. Then, appeared on the land animals, including some insects, others, called amphibians, they are able to live on land, can live in the sea. Later, when the plants grew up and became a forest, reptiles appeared. They are generally through the hatch and reproduction. Then some giant animals called dinosaurs appeared.They lay eggs, survival on earth more than one hundred million and four thousand in ten thousand. Sixty-five million years ago, however, the end of the age of dinosaurs. Why they suddenly extinct, remains a mystery.The extinction of dinosaurs makes the generation of mammals on earth. Mammals different past all the other animals, because they can produce the cub and give young mammals in the bodyFinally, some 2.6 million years ago, some small smart, with hands and feet of animals appeared, they scattered in different parts of the earth. So they went on to become one of the most important animals on the planet. They are on the earth, however, don't worry about it. They put too much carbon dioxide into the atmosphere, which makes the earth's heat cannot be released into space. So many scientists believe the earth may become too hot and not suitable for biological survival. So, in the future for millions of years, life can continue on the earth depends on whether this problem can be solved看我翻译了那么多求好评简单点就是The earth was formed millions of years ago, and later in the water, with the life. First before people is dinosaurs ruled the earth, but the final extinction, scientists put forward all kinds of guess, no one knows the correct answer.Many scientists believe the earth may become too hot and not suitable for biological survival. So, in the future for millions of years, life can continue on the earth depends on whether the global greenhouse effect can be solved最后两张简略版求好评，，...