Where did all the animals on Earth come from?

The fossil record is virtually animal-free up until about 540 million years ago, and then–boom–thousands of critters of all shapes and sizes show up.

Now scientists have found the fossils of some sponge animals that lived at least 100 million years earlier, at least 640 million years ago. The find proves that animals appeared on Earth slowly, and not suddenly and spectacularly, as the fossil record used to show.

ancient-ocean-life

The findings seem to solve one mystery, but they intensify another. Pushing back animal origins by 100 million years places their beginnings during a time called Snowball Earth, when our planet was almost completely encased in ice. If true, it means animals arose in an extremely harsh environment, not the relatively warm seas of today. Although it is also possible that sponges could have emerged before Snowball Earth and inhabited a haven just large enough to allow them to survive. Read more here or here.

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8 Responses to “Where did all the animals on Earth come from?”

  1. shawnice Says:

    were did animals come from all over the world?

  2. shawnice Says:

    were did animals come from?

  3. Marly Says:

    if animal became by ‘that’ or something, how did that be created?, do you know how we were created?, if god created this who created him? was a a man who was first in heaven and made this in under a week?….i have alot of questions though

  4. jave Says:

    this is so wierd in wondered what it was are those animals

  5. jave Says:

    haty hay

  6. makenzie matthey Says:

    cool

  7. jay.bee Says:

    Hey? good information, but what really happen and where really animals came from

  8. Nelly Says:

    Normally I don’t learn post on blogs, however
    I wish to say that this write-up very pressured me to check out and do it!
    Your writing style has been amazed me. Thanks, very great post.

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