The han dynasty invented paper
Public health
Sanitation standards were created to protect the common good in particular in cities.
During the Second Industrial Revolution, many began moving to the cities. Overcrowding of people and horses created large amounts of waste and very little clean water. Disease ran rampant and sanitation systems were put into place to protect the health of people.
Iran and Saudi Arabia have large Oil refining and Oil Shipping. So, it would be D) a and b.
It was first recorded in 1577 and spelt Giapan. When translated into English the name then becomes Japan. Hope this helps<3
