"the energy necessary to perform this function comes directly from the
(1)exchange of h2o and o2 during respiration
(2)blood flowing through the organs
(3)atp molecules produced during cellular respiration
(4)water that is eliminated by the organs"

I think the correct answer from the choices listed above is option 3. The energy necessary to perform this function comes directly from the ATP molecules produced during cellular respiration. Hope this answers the question. Have a nice day. Feel free to ask more questions.