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The (6)_______ stage spans from birth to two years. The first substage is when children exercise their (7)_____. The second substage involves primary (8)________ reactions while substage 3 involves secondary ones of these. Substage 4 involves goal directed behaviour, substage 5 involves tertiary circular reactions, and substage 6 involves using (9)_________. For Piaget, the fundamental task of infancy is the mastery of object (10)________ although recent studies have shown that infants have a better understanding of this than he thought. Childrens theories are usually called (11)________ theories and these are often concerned with physics and biology.