Who did research on the causes of psychological illnesses

Christine, a three-year-old child, often wears her mother’s shoes and carries her bag while pretending that she is going shopping. sometimes christine copies her mother in the kitchen by stirring in empty pots. which type of developmental change is christine experiencing? a- social and emotional b- psychological c- physical d- cognitive

What is the function of the retina?

What is the name of the device that senses the current flowing,tripping the circut,and cutting off the electricity