Why were iron tools more difficult to obtain than copper ones? O A. Iron requires a lot of sea salt.
B. Iron requires ore, which is rare in Africa.
C. Iron requires copper for smelting.
D. Iron requires more advanced technology.

Explanation: This is because iron is more reactive than copper in the metal reactivity series

keeping a cash reserve because cash flow is the the movement of money through a company and if it just sits there, it wont the movement

hello there!

the graphics that you have attached within the question, indicates that few people in bolivia work in industry according to its labor force.

however, the graphic that is on the right side of the picture shows the gdp sector in bolivia. this gross domestic product is a macroeconomic magnitude   that shows the monetary value of all finished goods and services within a country's borders in a specific time period. in this case, the graphic is showing the monetary value in each sector -agriculture, industry and services- of bolivia in 2012.

so, although the first graphic located at the left side indicates that not so many people work in industry, this is the second most important sector according to the gdp metrics because of the monetary value that impacts on its country. it does not need to be the most valuable one. if it makes an impact on the country's economy, it will be definitely crucial to it.