The fill in the blank is the separation of powers. Knowing this from the statement "<span>The power to enforce the rulings is vested in a separate branch of government than the power to issue the rulings."
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The Sudan, or Sudanian Region
The answer to this question is the letter A which is "more likely; because of sexual orientation differs in many twin pairs, other factors are also at work". Hence, to complete the sentence, we have it <span>Identical twins are somewhat more likely because of sexual orientation differs in many twins than fraternal twins to share a homosexual orientation; however, other factors are also at work.</span>