Questions: Information stored in long-term memory has no known organization. duration. importance. source.

The answer is the first one: organization.

Explanation for each option:

1. Organization: This option is correct. Information in long-term memory is known to be organized in various ways, such as through schemas, categories, or networks of related concepts. Therefore, it is incorrect to say that it has no known organization.

2. Duration: Long-term memory is characterized by its potentially unlimited duration, meaning that information can be stored for long periods, from days to a lifetime. Thus, it is incorrect to say that long-term memory has no known duration.

3. Importance: Information stored in long-term memory often has varying levels of importance, which can affect how easily it is retrieved. However, the concept of importance is subjective and not a structural characteristic of memory itself.

4. Source: Information in long-term memory can often be traced back to a source, such as personal experiences or learned knowledge. However, people may sometimes forget the source of the information, but this does not mean that long-term memory inherently lacks a source.

In summary, the correct answer is that information stored in long-term memory has no known organization.