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Даунов синдром

The most common chromosomal abnormality, Down syndrome results when a fetus has an extra copy of chromosome number 21. It causes mild to severe mental retardation, as well as other physical problems such as heart defects.

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Industry/Domain: Water bodies Category: Lakes

езеро Хурон

The second largest of the Great Lakes of North America, bounded on the west by Michigan (U. S. ) and on the north and east by Ontario (Can. ). The ...