Answer:
Conservation
Step-by-step explanation:
Conservation term was introduced by Jean Piaget in his theory of developmental psychology. This term comes in the third stage of the cognitive development stage which is called for its rational thinking and organization.
Conservation is the term that defines when the same quantity is there even if there are the shape, size, and volume has been changed. This has happened around seven-year-old children.
Juan and his little sister Anne are on the third stage of the cognitive-developmental stage. In this stage conservation procedure occurred with theses children.