Different enzymes have specific active sites which can only catalyze one <span>substrate. Enzyme-substrate complexes are produced only when the substrate fits into the active site :)</span>
Answer: Pigeon and duck.
Explanation:
From that side of the tree, you can see that the pigeon and the duck are closest together in the tree than the other organisms in the other options.
the <em>sun's corona</em> is only visable when there is a solar eclipse
I think the amount of ATP produced is best distinguishes glycolysis and the Krebs cycle from the electron transport chain.