In Sub - Saharan trade, gold , salt and slaves were the most important commodities.
Gold came from Bambuk in the valley of the Senegal where there was a lot of alluvial gold. Rock salt came from areas in the Sahara which were once covered by inland seas. Its extraction, in large blocks under the blazing sun, was appalling work carried out by slaves.
Slaves mainly came from around the region of Lake Chad, where the Zaghawa tribes made a habit of raiding their neighbors and selling them to Arab purchasers in the north.
Other important commodities were cola nuts, dates, copper and brass.
Answer:
algebra
Explanation:
Algebra was discovered by the Arabs, and they pronounced it as "Al-Jabr." Al-Jabr was at first a book made by al-Khwarizmi, and the word "algebra" derived from it.
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Answer:
Paired difference experiment
Explanation:
A paired difference experiment makes use of a paired difference test to compare two different measurements using the same unit to make inferences about population means. In other words, it is the assessment of population means by comparing two sets of measurements with the same unit,
A paired difference test can be used to assess the measurements gotten from before or after a treatment in an experiment. It can also be used to assess between controls and matching cases of diseases.
Answer:
Over-regularization
Explanation:
Over-regularization corresponds to grammatical errors which typically occur in the early stages of the language learning process of a child where language rules are applied too loosely, rather than the idiosyncracies (words that do not obey the normal language rules) that all languages have. For example, a child uses the word mouses instead of mice to denote plural of mouse.
