A coin has been discovered at a Native Americna site, and the reading suggests that the coin was not

First of all, the author of the reading passage suggests that the significant distance between norse settlements and native american can completely block any connections, thus preventing the norese from bringing the coin. The lecturer, on the other hand, challenges this statement by arguing that there has been evidennce about other objects from the settlements in nort america besides the coin, and the native americans may have travelled to  faraway places within NOrth america. Therefore, it's reasonable that they reached the settlements.

Secondly, the writer contends that since no other coins have been discovered at the sites, the coins are not part of the NOrse's belongings. The lecturer, however , rebuts this by asserting that tge site is just a temporary settlements for the norese, therefore it's possible that the norse pack up all there valuable possession including the coins with them when returning to Europe. 

Finally, it's stated in the article that the the norse wouldn't have brought the coins with them, for silver coins are of no practical use to Native Americans. However, the lecturer posits that the coins have values to the native americans as long as they appear to be interesting and attractive to them. They might want to possess the silver coin simply for its beauty. So it's still possible that the norse traded with north americans using the coins.