यह अहसास कि किसी का शरीर, मन और गतिविधियाँ अन्य लोगों से अलग हैं, किस रूप में जाना जाता है?

According to Piaget, the stage in which children develop object permanence is:

Kohlberg's highest stage of moral development is characterized by:

Which of the following behaviors in early childhood would MOST strongly indicate a need for developmental screening for Intellectual and Developmental Disabilities (IDD)?