How did the slave trade impact Africa?

In some places, the slave trade increased the power of the African monarchy and led to economic strength. However, in places where there was competition between slave traders, the slave trade undermined the African monarchy, led to constant chaos/war, destroyed political unity, and disrupted African society. The slave trade also impacted demographics of Africa. Millions of people were lost to the slave trade. Also, in certain parts of African, certain genders were taken as slaves more than others. This disrupted marriage and the sexual distribution of labor in Africa.

seeing as no choices were provided, i'll do my best to answer it from knowledge.

job specialization promotes work ethic to the person doing the job. he/she may be strong in the arms and able to lift things, specializing him/her in a job where you lift and carry.