Answer:
1.) Interaction 2.) Integrated into the individual mental structure.
Explanation:
Vygotsky is most recognized for his concepts such as the Zone of Proximal Development. According to Vygotsky, children who are under ZPD for a task can perform his task mostly without help, but they need help to complete and for the success of a task. Children gets instruction on how to do the task. They organize all the information getting from the existing environment and mental sachems. Children used that information in performing the task and eventually learn how to perform the task independently.
For example, when a child learns to ride a bike, his/ her grandfather not only holding the bicycle but even instructing him/her. From a child's point of view her/his grandfather is more knowledgeable than others.