Which of the following is an exergonic reaction? The conversion of one glucose molecule to two pyruvate molecules by glycolysis
The formation of ATP from ADP and Pi
The movement of a proton from the mitochondrial matrix to the intermembrane space
The transfer of electrons from O2 to NADH

Ivan is looking at a cross section of a stem taken from a vascular plant. he sees two different types of vascular tissue: the xylem, which is closer to the center of the stem, and the phloem, located around the xylem, closer to the outside of the stem. how do these two structures work together in a living plant?