The ABO system consists of A, B, AB, and O blood types. People with type A have antibodies in the blood against type B. People with type B have antibodies in the blood against type A. People with AB have no anti-A or anti-B antibodies.
Developmental dyslexia, or specific reading disability, is a disorder in which children with normal intelligence and sensory abilities show learning deficits for reading.
The development of the term, dyslexia, has evolved slowly during. the past sixty years. From the period of 1925-1960, various psychologists. and educators used such words as strephosymbolia to describe a conÂ­. dition of mixed brain dominance and uncoordinated brain functions.