___________ is the ability to understand that certain physical characteristics remain unchanged even when their outward appearance changes.
a. conservation
b. a formal operation
c. stability
d. a sensory operation

Respuesta :

I believe the answer is: A. Conservation

According to piaget's stage of development, children develop 
Conservation ability when we entered the ages of 7-11.
This 
Conservation ability is often used as a sign by psychologist to see that children is experiencing healthy rate of cognitive development,