Underwater breathing, without a doubt.
Photosynthesis would be nice, but everyone would call you a vegetable, and why would anyone want to not have to eat? I mean, think of all the tasty meat one would miss out on!
And I doubt that photosynthesis could even create enough energy to keep a human being alive, even if you walked around naked to expose sufficient amounts of your skin to direct sunlight.
Photosynthesis would be nice, but everyone would call you a vegetable, and why would anyone want to not have to eat? I mean, think of all the tasty meat one would miss out on!
And I doubt that photosynthesis could even create enough energy to keep a human being alive, even if you walked around naked to expose sufficient amounts of your skin to direct sunlight.