According to Jean Piaget's theory of cognitive development, what is the age period for the 'concrete operational stage'?

→ According to Piaget, during the first stage of development (birth to approximately 2 years of age), an infant learns best: → Under Jean Piaget's theory of cognitive development, upon detailed analysis of the essential and logical limitations of the 'Preoperational Stage', which of the following statements is scientifically most valid regarding the concepts of 'Egocentrism', 'Irreversibility', and 'Animism'? → According to Piaget, in which stage of cognitive development does a child begin to think logically about concrete objects and events? → According to Piaget, what is 'Assimilation'? → According to Jean Piaget's theory of cognitive development, in which stage does the trait of 'Object Permanence' develop in children? → According to Jean Piaget, in which stage of cognitive development does the quality of 'object permanence' develop in a child? → According to Jean Piaget, which is the final stage of cognitive development? → The four stages of children's intellectual development (sensorimotor, preoperational, concrete operational, and formal operational) were identified by whom?