<span>A series of complexes from electron
donors to acceptors happen in an electron transport chain. Due to the pumping action in the chain,
protons result to having a high concentration in the intermembrane space yet a
low concentration in the mitochondrial matrix.</span>
Answer:
A contour interval in surveying is the vertical distance or the difference in the elevation between the two contour lines in a topographical map. Usually there are different contour intervals for the different maps.
Explanation: