What can one catch that is not thrown?

The answer to this riddle "What can one catch that is not thrown " is a cold. We usually listen that someone catches cold, meaning someone is infected with a rhino virus that affects the sinus, nasal and breathing pathway in human beings.

are you asking for an essay and whats the story?

depends on your school

when i was in high school i took ap biology my senior year and it was the hardest one for me because my teacher finished the material within the first month of school and then went on to doing advanced college level it was horrible. but at a nearby school ap biology was one of the easier aps. also, it depends on what you are interested i like math a lot so ap calculus was easier for me than most but i hate history so ap us government was harder for me than most.