All those animals that existed on Earth before the time Man began to record his history are called "prehistoric".These include the first minute signs of life more than 600 million years ago, ancient fish, dinosaurs, and of course Man himself! It's unbelievable that the first one-celled animals eventually developed over millions of years into beasts such as giant tyrannosaurs, sabre-toothed tigers and s Human Beings!
The force of nature that causes animals to change and develop like this is called evolution.
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