Final answer:
Scholars use linguistic evidence to track the movement of Bantu speakers by comparing vocabulary and grammar among languages to identify patterns and migrations.
Step-by-step explanation:
Scholars use linguistic evidence to trace the movement of Bantu speakers over thousands of years by comparing vocabulary and grammar among languages to track migrations. By studying the similarities and differences in language across different regions, linguists can identify patterns and movements of Bantu speakers throughout history. This linguistic evidence, along with archaeological traces such as pottery and ironmaking technology, provides insights into the multiple waves of Bantu migrations.