People learned about dinosaurs only 150 years ago, although these huge creatures inhabited the earth for as long as 160 million years, long before the ancestors of a man appeared on it. In the twenties of the last century, the fossilized bones of unknown creatures were first discovered. Later on, these fossil remains, scientists were able to restore the appearance and way of life of prehistoric monsters.
Dinosaurs were reptiles or reptiles. The word "dinosaur" means "terrible lizard". Many of them, like ordinary lizards, had hard, scaly skin. Hundreds of science-known species of dinosaurs are divided by scientists into two orders: the bird-dinosaurs, whose hind legs are similar to the bird's, and the lizhorotaceae, whose pelvic bones resemble lizards.
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1. have begun
2. was explaining