Final answer:
The proto-Bantu people spread their language, farming practices, and ironworking technology as they migrated southward.
Step-by-step explanation:
The proto-Bantu people spread along with their migrations, taking their language, farming practices, and ironworking technology with them. As they moved southward from West and Central Africa, they established farms and introduced agricultural practices to new regions. The Bantu migrations gradually transformed the linguistic and cultural landscape of sub-Saharan Africa.