The question asks for two characteristics of Snowsight worksheets. Based on the community discussion and Snowflake documentation, option B is correct because each worksheet operates as a unique Snowflake session, allowing different roles and queries independently. Option E is correct because worksheets can be imported and shared with other users, as confirmed by documentation links and high consensus (73% of votes). Option A is incorrect because folders cannot be nested (no 'folder of folders'). Option C is incorrect as users can run multiple queries on a worksheet. Option D is incorrect because switching worksheets does not end the session; each worksheet maintains its own session.