The history of the ancient empire of Ghana is largely drawn from written observations made by outsiders to the area. The two most common descriptions come from the eighth-century Arab geographer al-Fazari and the 11th-century Arab geographer al-Bakri. Why might someone be skeptical of these accounts? Outsiders like these tended to compare Ghana to the more prosperous cities of east Africa.
Al-Bakri and al-Fazari were both Muslims who tended to be biased against non-Muslim groups.
Both geographers were trained in Islamic Spain and saw Africans as slaves. The accounts of outsiders have likely been altered to suit the needs of later empires like Mali

Recall that areas with high net primary productivity not only produce high levels of biomass rapidly, they also take up large amounts of co2 and give off large amounts of oxygen. what is the likely result of the increasing amounts of sediments and fertilizers in the major rivers emptying into oceans and affecting algal beds, reefs, swamps, and estuaries? a fisheries will improve as the extra nutrients feed shellfish and fish. b eutrophication, followed by hypoxia, is a likely result, ultimately leading to less co2 uptake and more oxygen released. c productivity in these areas will increase permanently, leading to more co2 uptake and more oxygen released. d eutrophication, followed by hypoxia, is a likely result, ultimately leading to more co2 uptake and more oxygen released. e eutrophication, followed by hypoxia, is a likely result, ultimately leading to less co2 uptake and less oxygen released.