What factors might account for differences among taxa in, Ask an Expert

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What factors might account for differences among taxa in their numbers of extant species? Suggest methods for determining which factor might actually account for an observed difference.

What protein complexes do NADH and FADH2 pass electrons to in the electron transport chain? Why does this creates 2.5 ATP per one NADH molecule, but only 1.5 ATP per one FADH2 molecule?

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