Answer:
Concrete operational stage starts at age seven and continues to age 11
(7-11).
This stage is characterized by logical thought.
An important development during this stage is mastery of the concept of conservation as well the ability to reason logically.
Children have learned that pouring liquid from a tall, narrow glass into a shallow dish doesn't reduce the amount of fluid.
During this stage , a child's thought starts to grasp the concept of time , space and numbers. The child starts using categories and principles.
