Your sister-in-law is amazed at her 9-year-old son. She can remember when her son was not able to sit and listen to a story for very long and now he is able to listen intently and remember the story in very good detail. What two advances occur during middle childhood in information processing abilities that assist with his newly developed abilities?

Attention and memory

Explanation:

Attention and memory are the two skills developed in the body which is led to   the development of abilities.

As a child he had a good memory that is the reason he remember the whole story. This happened at the time when he was not able to sit.

When he grew up he started taking interest in the story and paid attention to the story again.

This is the reason the child remembers the story very well.

uh two lol

nucleus

would be most reasonable answer tbh