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ལྡུམ་མཆེད་དུས་རབས།

biol. The Devonian period lasted from about 409 million to 363 million years ago. During this period fish became abundant; the first amphibians evolved, and the first forests appeared ལྡུམ་མཆེད་དུས་རབས་ནི་ལོ་ས་ཡ་ […]

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