Yes, how could I forget, one of our projects for Mr. Schaeffer's biology class was to create a hermetically sealed ecosystem in a jar. There had to be a plant to produce oxygen for the creature to live there and some other things to be considered for the elements of life to be self-sustaining within the jar, hermetically sealed by means of a screwed-on lid. So, ok, I get that point, that works for a while, certainly, and then later things start to go kaflukey, the plant or animal dies, and then eventually the ecosystem jar is abandoned for lack of interest, because anyway it was only a short-term project.
No need to live forever in someone else's pressure cooker.
