The structure that is responsible for releasing energy from food molecules in some singled celled organisms is MITOCHONDRIA.<span> The major function of mitochondria is to carry out cellular respiration, which make energy available for the cells to use. The mitochondria is also called the power house of the cell, because it is the organelle that specializes in turning the food molecules into the energy form that is usable by the cells.</span><span />
I believe the answer would be sweat
Body fluid that hard to be seen by naked eye must be clear(have no color) and not thin. Blood would be out of the question as it red color will be easy to perceive. Semen color is white but it will be clear after a while, but it was thick and has a strong smell.
Saliva is clear but mostly it has some bubles and a bit thicker than sweat. Sweat would be the hardest to find as it was clear and mostly water. But it gives less information as evidence than the other fluids.
4 i guess........................
Just ask whatever college your wanting to go to!
