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Biological Environment > Flatworms Today |
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This site tells the story of the history of the universe. Click Earlier and Later to follow the story. Note: Many facts have been simplified to make them easier to understand. |
The ancestors of most animal groups were probably similar to modern flatworms (platyhelminths). Approximately 13,000 species of flatworms are found on Earth today. They are grouped in five classes:
For more information of flatworms, click here. |
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Biological Environment > Flatworms Today |
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