[quote=@DarkwolfX37] They do not require more effort. You made an irrelevant point. "How inefficient it is" doesn't necessarily mean "inefficient overall" though the human body definitely is, it could also mean "not efficient enough" which is what I meant. There is absolutely no reason we should produce anything other than liquid waste. [/quote] It technically does. On Apple phones, quotes require two clicks and mentions require one. We don't use all the molecules.