Answer:
Agriculture, Natural Resources and Trade
Step-by-step explanation:
Africa or the "tropical zone" carries out various economic activities to boost the various nations wealth and stability.
1. Agriculture: All African countries take part in some sort of agriculture or the other by harvesting: wheat, maize, beans, vegetation or even animals.
2. Natural Resources: Tropical zone countries rely on their natural resources to provide profit through trade, these countries are blessed with resources like coal, oil, gold, diamonds etc.