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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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.
Click here to read Time Crystal, history of the Universe as sci-fi fantasy romance!
Note: Many facts have been simplified to make them easier to understand.
Click here to read Time Crystal, history of the Universe as sci-fi fantasy romance!
