Does anyone know what the solid orange line represents?

Who was the first president of the united states (just trying to y’all get points)

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.

When was wheeled traffic permitted in early rome? daytime nighttime all day never