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The planet earth is VERY old, about 4,600 million years. (That's a lot of birthday candles!!!).
* There was no life at all on earth for millions of years.
* The first living things lived in the sea, and they were so tiny that we would not be able to see them.
* About 500 million years ago the first fish swam in the sea. There was nothing alive on the land at all.
* 435 million years ago the first plants started growing on the land.
* 395 million years ago the first land animals appeared.
* 225 million years ago dinosaurs appeared.....
* and 65 million years ago All the dinosaurs died.
* Only 2 million years ago the first human appeared.
Dinosaurs lived on the earth for 165 million years (and we have only been here for 2 million!!!). No one really knows why the dinosaurs died. Some people think that the dinosaurs died when a huge rock fell to earth from space (a meteorite).