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Scientists Discover Ancient Shrimp Had Heart

Scientists have discovered the world's earliest known cardiovascular system - heart and blood vessels - in the fossil of a shrimp-like creature from more than 500 million years ago. The rare find sheds new light on the evolutionary timeline of life on Earth. The Yunnan Province in southwestern China is known for rich fossil deposits, but researchers had not expected a fossil so exquisitely preserved as the specimen of the 520-million-year-old shrimp-like species. Researcher Peiyun...

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