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  13.810 milions years ago an explotion ocurred that marked the beginning of the univers.
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  First appaerance of prokaryote life.
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  Photosynthesis is a process used by plants and other organisms to convert light energy into chemical energy.
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  Oxygen appeared with the first photosynthesis and radically changing the atmophere.
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  Ice Age.
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  Appeared the first eukaryotes cells.
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  First appaerance of eukaryote life.
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  Appeared the first mulicellular organisms.
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  The first mass extintion ocurred in this period, about 500 million years ago.
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  A sencond mass extiontion ocurred about 360 million years ago.
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  The gymnosperms are a group of seed-producing plants.
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  This extiontion paved the way for a diversification of land plants, insects and amphibians.
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  The next massextintiontook place at the end of the Paleozoi era.
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  Plants are mainly multicellular, predominantly photosynthetic eukaryotes.
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  The "Age of the Dinosaurs".
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