Lev Vygotsky referred to the difference between what a child can do on his own and what can be accomplished with some assistance as:

According to Vygotsky, the most developmentally significant form of play is:

Ramesh, an 8-year-old child, mostly interacts with his younger, less mature siblings. According to Lev Vygotsky's socio-cultural theory, what is the most likely result of this interaction?