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The north and south regions had very diferent economies in the 1800s.

In he example code, what does the title attribute create? a tool tip an element a source a markup

The open systems interconnection (osi) reference model: defines standards for many aspects of computing and communications within a network. is a generic description for how computers use multiple layers of protocol rules to communicate across a network. defines standards for wireless local area network (wlan) communication protocols. details the advantages and disadvantages of various basic network cabling options.