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Birth defects are often the result of a genetic problem, and there are many such types of disorders.
Others, however, have non-genetic causes. Sickle cell anemia 2. Piaget claimed children go through 'stages' in the development of thought. The child then watches an experimenter pour one of these into a tall thin glass, filling it almost full. Birth defects are often the result of a genetic problem, and there are many such types of disorders.