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deviation

phys. 1. The angle formed between a ray of light falling on a surface or transparent body and the ray leaving it. 2. The difference between one of an observed […]

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Devonian period

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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