World War I resulted in which of the following medical advancements?

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.

What is one way china and canada are different

Which new deal agency was most affective in aiding farmers during the depression