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Biological Environment > Ancestral Flatworms |
Earth Earlier Earlier 570 Million Years ago Later Earth After Animals Later |
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. |
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Early forms of jellyfish seem to have evolved into various different kinds of worms, one of which was the ancestor of flatworms. They, in turn, probably evolved into higher animals. Ancestral flatworms may have first appeared around 570 million years ago. Here we see the basic plan laid out for the structure of the body which would be used and modified by all later groups of animals.
Organs
Brain
Bilateral Symmetry
Flatworms today
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Earth Earlier Earlier 570 Million Years ago Later Earth After Animals Later |
Biological Environment > Ancestral Flatworms |
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Basic Information |
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