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20 August, 15:26

Simple, prokaryotic organisms have been on Earth for over 3 billion years and have been able to grow and evolve into many different and successful prokaryotic organisms. Which structure evolved in cells approximately one billion years ago that allowed for the forming of more complex, multicellular organisms?

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  1. 20 August, 15:29
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    Atoms

    Molecules

    Organelles

    Cells

    Tissues

    Organs

    Organ systems

    Organisms

    Populations

    Communities

    Ecosystems

    Biosphere
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