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4 godz. temu · Tooth decay, also known as cavities or caries, is the breakdown of teeth due to acids produced by bacteria. The cavities may be a number of different colors, from yellow to black. Symptoms may include pain and difficulty eating. Complications may include inflammation of the tissue around the tooth, tooth loss and infection or abscess formation. Tooth regeneration is an on-going stem cell based ...
1 dzień temu · Race is a categorization of humans based on shared physical or social qualities into groups generally viewed as distinct within a given society. The term came into common usage during the 16th century, when it was used to refer to groups of various kinds, including those characterized by close kinship relations. By the 17th century, the term began to refer to physical (phenotypical) traits ...
1 dzień temu · The Iberian Peninsula (IPA: / aɪ ˈ b ɪər i ə n /), also known as Iberia, is a peninsula in south-western Europe, defining the westernmost edge of Eurasia.Separated from the rest of the European landmass by the Pyrenees, it includes the territories of Peninsular Spain and Continental Portugal, comprising most of the region, as well as the tiny adjuncts of Andorra, the British Overseas ...
