What would be my independent variable if my problem statement is - which type of container traps the most heat , a shoe box covered in aluminum foil, plastic wrap , or wax paper

This is an ap world history question. i am working on a worksheet which has a vent diagram with each circle labeled either us or byzantine economy. the middle is the similarities. can someone explain to me the similarities and especially the differences between the two?

Which theory of color vision most accurately describes the process of color vision at the level of the retina?

What is the role of boundaries, and how do they function within or between states