Interdependence means "the dependence of 2 or more people or things on each other". You basically depend on each other for goods, support, etc.
Specialization means "the process of concentrating on and becoming expert in a particular subject or skill." What this means is that you basically just focus on mastering a certain job or skill.
Colonies depended on Europe for trade, because most european countries only allow their colonies too trade with them. Without other people too trade with, colonies start to depend on Europe too get whatever they want, and also depend on europe too get money for their products
hope this helps :D
