Listener Jon sent us this question: "I just purchased some dart frogs which need to live in high humidity conditions. In order to attain this we basically sealed off the terrariums. The question is whether a really sealed terrarium could provide enough oxygen for the frogs through plant photosynthesis alone. Who would win: the frogs or the plants?" Phil Sansom got the answer to this 'pet peeve' from plant scientist Stephanie Smith... Like this podcast? Please help us by supporting the Naked Scientists