What were some inventions from the ming dynasty? ?

Which is likely the most serious problem associated with an epidemic? 1. there are sometimes no cures to the diseases that spread. 2. people often die from the diseases that spread. 3. there are usually no ways to prevent people from getting ill. 4. people often don’t know they have a disease.

Rachel carson 1962 silent spring was a groundbreaking work regarding what topic

1. what was the purpose of the communist international organization?