You drink two cans of your favorite sugary soda, even though you know this is not healthy for you. You have to run to the bathroom before the next class period starts. What body system does that use?

it's the under parts of the car

well it depends i think people around the world are coming around to gay marriage. but if you are talking abortion then wow, so much to talk about. such as men thinking they have the right to choose if women can, the fact there are health concerns if the women can't get one, and many more arguments to discuss. so i would definitely say abortion would be a much more interesting topic.