Cellular respiration and photosynthesis are complementary processes because they use each others' products and reactants.
Photosynthesis' products are cell respiration's reactants; likewise, cell respiration's products are photosynthesis' reactants.
Also, photosynthesis is known to take away carbon dioxide from the air and put in oxygen while cellular respiration does the opposite, putting in carbon dioxide while taking away oxygen.
So they all got LEU, SER
Three first got GLU at the sam place
The one least related must be organism number 4.
Hope that helped.
C. Mutagens causes mutations.
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hope that helped you on your journeys