The paired passages make a changed estimate and its stated basis inspectable. They also demonstrate why the revision link matters: the main paragraph can convey a different temporal scale if read alone.
The later layer changes the question instead of merely adding another fact. Its unresolved close preserves the gap between having new observations and having an adequate explanation for them.
The sequence makes the inference inspectable in both directions: conditions produce a form, and the observed form can suggest prior conditions. Calling it a guess prevents the teaching scene from posing as a complete field test.
The recovery account exposes the evidentiary basis beneath the preceding narrative. The chapter also leaves a boundary between the inferred former environment and the suggested transmission of an Atlantis-like story.
Reviewed examples have a source-linked editorial interpretation. Detected candidates are exact passages or structures retrieved by an explicit rule and still need interpretation. Neither label establishes a cause of bestseller longevity. No missing text is counted as a negative example.
