yes you cansuch as you can make a plant watering thing out of laundry detergent
..................O_O You...can't? Unless you blast a hole in them or they're certain liquids or gases? Unless you mean obstacles in your life, which you're gonna have to be a liiiiiittle more...
"block", "blockade", "close up", "embarrass", "hinder", "impede", "jam", "obturate", "occlude", "stymie" and "stymy"
Yes.
oxygen, lungs, gills if you are a fish