The prehistoric world was very different from our own
The world we live in has not always been as it is now. Human beings have changed the world dramatically in the past few thousand years. Forests have been cut down, cities have been built and marshes drained. These changes continue today. Even before humans evolved, the world was changing. New types of animals or plants were constantly appearing, and older types becoming extinct.
from the book "100 Things you should know about prehistoric life"
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