ATP, which is a storage molecule that stands for adenosine triphosphate. The body requires ATP in order to be able to perform basic functions. ATP is found in the mitochondria of cells.
A 'red' apple does not emit red light. Rather, it simply absorbs all the frequencies of visible light shining on it EXCEPT for a group of frequencies that is perceived as red, which are REFLECTED. An apple looks red to us because it REFLECTS infrared waves.
