All aspects of cognitive functioning are affected. Both result in parts of the brain not functioning properly. There are no properly functioning government institutions. Taurine is necessary for normal skeletal muscle functioning. Critical infrastructure is vital for the essential functioning of a country. This can occur on test cases that were previously functioning properly. Deficiencies result in disorders of the skin and poor immune functioning. Predictive replacement is the replacement of an item that is still functioning properly. Ideasthesia is congruent with the theory of brain functioning known as practopoiesis.. Withdrawal can cause mild to clinically significant distress or impairment in daily functioning. These periods are often interspersed with periods of relatively normal (euthymic) functioning. Vestigial structures are often homologous to structures that are functioning normally in other species. Thus, the public education system was not functioning between 1997 and 2001. Vitamin A is essential for the correct functioning of epithelial cells. Studies show that ICM improves many of the relevant outcomes including social functioning.