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The definition of an anxiety disorder also includes an impairment of day-to-day functioning. A person with an anxiety disorder often experiences a significantly reduced quality of life and anxiety disorders are associated with possibly fatal heart conditions. Those that support animal testing say that is a necessary practice. They mention that firms that count on animal testing do use humane techniques to feed, house and care for the animals. Supporters also claim that options to animal testing are certainly not as far reaching, lacking a chance to figure out how cosmetic products affect living tissue and organs.