What communication breakthroughs are connected with each of these dates? 25,000 bce 6,000bce (8,000 years ago) 1,500bce 600ce 1,450ce

These  breakthroughs are connected with each of these dates because they are forerunners of an invention that is a milestone in human communication: the printing press.  

About 25,000 years ago  humans learned to speak. Next, The first picture writings date from 8,000 years ago. Followed by the first evidence of an alphabet which comes from Phoenicia around 1,500 BCE. In 600 CE The Chinese introduced woodblock printing.Finally,Johannes Gutemberg invented the first practical printing press in 1,450CE .

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the answer to fill in the blank in this question would be the word resource, it is defined as the money, material or people (since human resource is a very valuable good) that a company or a person has at disposition (meaning they can use the resource as they see fit), to be able to complete a task or achieve a goal.