Weak memory and the time of transmission

Read-only question overview. Answers and scoring remain inside authenticated learner attempts.

• How is the amount of incorrect transmission described?
• What is weakness present from the beginning and persisting?
• Which labels describe the later-affected narrator and the report, respectively?
• If research establishes a report as preceding the deterioration, what is its ruling here?
• What is the ruling when the report is established as later?
• What if it is unknown whether a report is earlier or later?