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Ein Magnetfeld kann erzeugt werden, indem Elektrizität durch einen Draht geleitet wird. Alle Magnetfelder werden durch Bewegung geladener Teilchen erzeugt. Sogar der Magnet an Ihrem Kühlschrank ist magnetisch, weil er Elektronen enthält, die sich ständig im Inneren bewegen.
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Cancer is unchecked cell growth. Mutations in genes can cause cancer by accelerating cell division rates or inhibiting normal controls on the system, such as cell cycle arrest or programmed cell death. As a mass of cancerous cells grows, it can develop into a tumor.
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Clean air and water are limited resources. ... The conservation of natural lands and of working farms and forests can generate financial returns, both to ... In addition to health and food benefits, conserving land increases property values near ... and the creation of trails and parks are often viewed in terms of their costs.
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