Final answer:
The Sahara and Sahel's arid landscapes limit settlements and require nomadic lifestyles, while the savanna and tropical rainforest support more stable agriculture and smaller, resource-based communities, respectively. The type of work varies from herding and trade in arid regions to farming and livestock rearing in more fertile areas. Travel methods adapt to the environmental conditions, with camels in arid zones and river navigation in wetter regions.
Step-by-step explanation:
The characteristics of the Sahara, Sahel, savanna, and tropical rainforest greatly impact where people live, the type of work they do, and how they travel. The Sahara is a vast desert with limited water and vegetation, resulting in sparse human settlements mainly engaged in nomadic herding or trade across the desert. The Sahel, a semiarid region, supports some agriculture and herding, with adaptations to the periodic drought conditions. The savanna offers fertile soils along riverbanks, seasonal rains critical for agriculture, and vegetation that supports a rich array of wildlife. Consequently, people in the savanna engage more in farming and livestock rearing. The tropical rainforest, with its high biodiversity and rainfall, is less suited for large-scale agriculture due to dense vegetation but provides resources for small-scale cultivation, hunting, and gathering.
In the savanna, for example, the presence of grasslands dominated by grasses is due to well-drained soils and a seasonally dry climate. This environment sustains vast herds of grazing animals, and subsequently, the human population here engages in pastoralism and agriculture. Moreover, the savanna's seasonal rains determine the planting and harvesting periods. The travel methods in each biome are dictated by the environment, with people in the Sahara and Sahel often using camels to navigate the arid landscapes, while those in the savannas and tropical rainforests may rely on rivers for transportation.