The correct answer is B. An ecosystem resource; an ecosystem service
Explanation:
In ecosystems, a resource refers to any substance, material, object, etc. that is necessary for the biological processes of organisms, for example, breathing, growth, reproduction or nutrition. In this way, water is an example of an ecosystem resource because this natural resource is necessary for the life of almost all organisms. On the other hand, an ecosystem service refers to natural processes and systems that benefit humans, in the case of water cycle this is an example of an ecosystem service because due to this, humans get potable water to drink, water for growing plants and animals, among others.
The natural resources in Ghana,Mali and Songhai contributed most to the growth and power of these empires.
•It brought about the beginning of the trans Saharan Caravan Trade in the 13th and 14th centuries.The gold-salt trade in Africa made these empires very powerful since they controlled the trade routes and taxed traders
•Cities also developed in Ghana,Mali and Songhai because their resources were in high demand and the overland trade routes connected them to west Africa
•The T.S.T brought about the spread of Islam throughout west Africa. The Muslims also sold their commodities (textiles,beads,camels and others) in exchange for gold and salt
moving southwest towards mehiko
