What does NOT describe the slave trade as it existed in Africa by 1700

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Explanation:More than one-third of slaves died before reaching the coast because of thirst, disease, or exhaustion.

b.provides a written record of the transaction

the conditions that made the byzantine empire vulnerable to attacks by the muslin turks were the sack of constantinople by western crusaders, the conquests of the sultanate of rum, presence of rival kingdoms and finally the set up of fiefdoms at the empire which were owned by the ghazis (turkish warriors).