While his leader was away, they disappared but nobody knows why and where they went.
According to the theory presented in the reading passage, they moved to a different island. It is believed this is because, when the leader came back, he found the word "Croatan" carved onto a fence post and "Croatan" is the name of an island in the vicinity of Roanoke Island.
In the listening passage, the professor said that the theory presented in the reading passage is not the most credible theory. He also provided three reasons in order to cast doubt on the theory expressed in the reading passage.
First of all, he said that lots of people have tried for ages to find proof demonstrating the presence of the colonists on the Croatan Island. However, no proof has been found.
Second, Croatan is not only the name of an island. Lots of places are called Croatan. Thus, the word has many different meaning and it's incorrect to think only about Croatan Island.
Third, a singular colony was found in the 18th century. They were called "Croatan" and they used to speak English properly. Moreover, they had blue eyes and some of them had blond hair. According to this theory, this colony is the same colony that had been lost in the 16th century.
In conclusion, the professor said that this theory, the third one, is one of the most credible ones rather than the theory presented in the reading passage which is not a really good one.
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