Meanings of odd function in English

I'm surprised I can even function after the last two weeks.

Though unlikely, the X-37B could even function as an orbital bomber.

For instance, there's the matter of whether the human body would even function without gravity.

Under certain conditions, landfills may even function as sinks for CH4 and selected NMOCs, like aromatic hydrocarbons and lower chlorinated compounds.

Even functioning spy gear is useless if you don't use it right.