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Biological Environment > Sponge |
Earth Earlier Earlier 700 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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Just as algae gained by living together in colonies, so protozoa began living together. The earliest many-celled animals might have been sponges, which are bottle-shaped animals which look like plants. A current of water is drawn in through small holes in their sides by the beating of tiny whip-like hairs (flagella). Food is filtered out of the water current, which leaves through a large hole at the top.
Sponges might have evolved into jellyfish. Sponges might have appeared around 700 million years ago. |
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Earth Earlier Earlier 700 Million Years ago Later Earth After Animals Later |
Biological Environment > Sponge |
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Basic Information |
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