Answer:
Biodiversity
Step-by-step explanation:
The reduction in the number of African elephant by 30% is called biodiversity.
Biodiversity is the reduction of a particular specie of animal . This is been facilitated by natural cause or man made cause. Of such natural cause include illness and diseases ,while the man made cause involves the harvesting of specific features of the animals.
In African majority of such decline can be attributed to man made factor because the African elephant trunks,hide and meat are been harvested and sold for high money value.