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The manager <a href=" http://www.cornwallfoodanddrink.co.uk/buy-papers-for-college-online/ ">program management career essay ee</a> A 520-million-year-old fossil recently unearthed in South China has revealed the earliest and best preserved nervous system ever discovered. An international team of scientists found that the spider-like marine creature, never before described, belonged to an extinct group of arthropods known as megacheirans (Greek for Ã¢Â€Âślarge clawsÃ¢Â€Âť), which were joint-legged invertebrates with great claw-like appendages sticking out of their heads. The arthropod phylum includes insects, spiders, and crustaceans.