The differences were far greater. For starters, they had different beliefs, and not only religious beliefs but about life in general. They also used different weaponry and went through different types of training. Knights would also have land and control it while pledging allegiance to the King, while Samurai were not as powerful as nights were and were more just soldiers. They also came from different social backgrounds. If a knight's king would die they would just pledge their allegiance to the new king, while Samurai's lord's death would mean more or less the end of a samurai's job.
Answer:
Invasive species, including communicable diseases, etc..
The correct answer is "Zoning codes controlled the types of buildings, where they were built, and encouraged safety improvements.
In the early days of the Industrial Revolution, the number of buildings to accommodate the great numbers of people coming from the countryside grew disorderly, which resulted in narrow, filthy, and bad-smelling streets where diseases and epidemics could spread rapidly.
