When they migrated, it caused a shift in agriculture. They brought their techniques and tools with them.
Explanation:
In central Africa, the spread of Bantu-speaking people had effects on the environment. Introducing new crops and farming techniques altered the natural landscape. Raising cattle also displaced wild animal species. Agriculture improved the ability of Bantu-speakers to reproduce and expand more quickly.
With indigenous foragers and nomadic tribes they encountered, the Bantu shared their knowledge of iron-smelting, pottery-making, and their farming abilities, many of whom gradually settled into prosperous village societies. They thought them many of things thought brought them joy and survival.
I believe sentence 4 should be removed from this conclusion as it restates something that has already been said, instead of explaining why the author believes this. Not to mention, sentence 4 seems to be out of place.
