Answer:
#1 goes with box - 4
#2 goes with box - 3
#3 goes with box - 6
#4 goes with box - 2
#5 goes with box - 1
#6 goes with box - 5
The three main stages of cellular respiration (aerobic) would include Glycolysis, the Kreb's Cycle and the Electron Transport Chain. The Krebs Cycle takes Citric Acid which is a derivative of Pyruvic Acid and converts this through 4 cycles into Hydrogen, carbon dioxide and water in the Mitochondrial Matrix.
The Answer to this question is b