Final answer:
In the sensorimotor stage, children learn about the world through their senses and motor behavior. They explore and interact with their environment using their senses and actions. One important milestone in this stage is the development of object permanence.
Step-by-step explanation:
The major characteristic that takes place in the sensorimotor stage is that children learn about the world through their senses and motor behavior. During this stage, infants explore and interact with their environment using their senses, such as touching, tasting, and smelling, and through their actions, such as reaching, grasping, and moving objects. One important milestone in this stage is the development of object permanence, which is the understanding that objects continue to exist even when they are out of sight.