If people move to the moon, how can they continuously provide oxygen to humans? This is a question. Don’t answer blindly. Thank you.

I think it is unlikely that plants can produce oxygen.

Because plants need soil, water, and nutrients, the biggest drawback is space. There will definitely be a lot of people there, and there won’t be enough place for people to live. How about giving it back to plants? I think the most likely possibility is to artificially synthesize foreign gas. For example, the current technology is to electrolyze oxygen. But if it goes to the moon, water is also expensive, so it is unlikely. The most likely possibility is to extract oxygen atoms from other substances and then synthesize foreign gas. It's more realistic. Isn't there a laboratory in the United States that is researching in this direction?