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Hace 1 día · Rock and roll emerged as a defined musical style in the United States in the early to mid-1950s originating from African-American music. It derived most directly from the rhythm and blues music of the 1940s, [1] which itself developed from earlier blues, the beat-heavy jump blues, boogie woogie, up-tempo jazz, and swing music.
Hace 1 día · Taxonomy. The narwhal was one of many species originally described by Carl Linnaeus in his 1758 Systema Naturae. An early 1555 drawing by Olaus Magnus depicts a fish-like creature with a horn on its forehead; Magnus later assigned it to "Monocerote". Its name comes from the Old Norse word nár, meaning 'corpse', which possibly refers to the animal's grey, mottled skin and its habit of ...
