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Sample text

As less successful species die, more room is made for new species to develop. It’s hard to believe, but scientists think as many as four billion species may have come and gone during Earth’s history. That means that 99 percent are extinct! Remember, though, that if none of the plants and animals had become extinct, there would have been no opportunity for the evolution of the many newer forms of life that exist on Earth today. Trace the path of this imaginary animal from its first appearance through evolutionary changes to the way it looks today.

See if you can avoid extinction and find evolutionary success! NOW PUT ON YOUR THINKING CAP Think about the traits that made this animal successful and answer these questions. Was this animal a carnivore (meat eater) or an herbivore (plant eater)? How do you know? When would flat, broad teeth be an advantage? What kind of climate did this animal live in? How do you know? When would long, woolly hair be desirable? The Record in the Rocks Life first appeared on Earth about three and a half billion years ago.

180 million years ago. Pangaea begins to break into a northern continent (Europe, Asia, North America) and a southern continent (Africa, South America, Antarctica, Australia). 3. 135 million years ago. The North Atlantic Ocean opens, separating North America from Europe and Asia. 4. 100 million years ago. The South Atlantic Ocean opens, separating South America from Africa. 5. 65 million years ago. Antarctica, India, and Australia separate from Africa. 6. Today. Map shows the present positions of continents.

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