Jenni is turning 50 and has noticed that her sight isn’t as good as it was when she was 40, especially when reading small print in newspapers and books. As a result she has to hold these items very close to read them. Which condition best describes what Jenni has?

The changes to agriculture in the united states since 1900 is that increased mechanization has increased food production, thereby increasing the need for labor. there has been an increased need for higher speeds of food production due the fact that the population in the united states continues to rise.