Will give brainliest for best answer!
what did the empires of ancient africa invent/contribute?

The achievements of the Songhai empire of pre-colonial West Africa include the creation of a standardized system of weights and measurements. The Songhai empire was the largest empire in African history, with several thousand cultures under its control and more territory than any other African empire to modern day.

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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.

lancelot said to the beautiful ellen i c u r a b u t l n (i see you are a beauty lancelot was the greatest and worst of the knights who became the king's champion and undertook quests in the king's name. he became the adulterous lover of queen guinevere, and they had a son named galahad.