Research suggests that homework is most effective when it is extensive and time consuming. it is moderate and geared towards children's developmental levels. it is only used in middle and high school. there is little research supporting any benefits of homework.

I believe the answer is: . it is extensive and time consuming.

When homework is extensive and time consuming, students would be forced to spend their time reading a lot of materials and understanding the core of its content. Because of this, the information that they get from doing the homework would stay longer in their memory and help them even in future tests.

Sector is best defined as (part).