Answer:
Two-field system
Explanation:
Two-field this is more than 1 and there are more crops being grown
We would die because the other gases in the air, such as nitrogen, dilute it and make it safe to breathe
The immediate cause of World War 1 is the assassination of Archduke Franz Ferdinand of Austria-Hungary.
The correct answers are B) salt was used as a form of currency and D) salt was used to preserve food.
<em>The two factors that explain why salt was so valuable to West Africans are salt was used as a form of currency and salt was used to preserve food.
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Salt for West Africans was of the utmost importance. It served as a currency that allowed themto trade gold for salt. Yes, salt was a necessary element for people to survive because salt was used to preserve food. West Africans knew how to find grains of salt from the river beds after rainfall. People from the North of Africa had abundant gold, but no salt. So they often traded gold for salt with Western Africans. So the two factors that explain why salt was so valuable to West Africans are salt was used as a form of currency and salt was used to preserve food.
