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Carlos is looking at a picture of a convergent boundary on which a volcanic arc and a trench are identified. which type of convergent boundary is carlos looking st?

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?

Who pays into social security a employees b self employed c employers d all of the above