Final answer:
According to Piaget, cognitive development occurs through a fixed sequence of stages.
Step-by-step explanation:
According to Jean Piaget's theory of cognitive development, cognitive development occurs through a fixed sequence of stages. Piaget proposed that there are four stages of cognitive development: sensorimotor, preoperational, concrete operational, and formal operational. These stages represent different ways of thinking and reasoning that individuals go through as they grow and develop.