What did horses and oxen become?

By 1900, horses had replaced oxen on the farm. Horses were used for almost all of the field work. In addition, many new machines had been created to help farmers to do their work. These machines could plant, cultivate, and harvest crops faster than a farmer could by using their hands.

Explanation:

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.

a. theta waves. this is because the person is in a light sleep which means the brain waves would show these kind of waves.