The executive branch is the most important because it is the one that carries out laws therefore without it there would be no laws therefore allowing total chaos. That is why it is the most important branch.
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Answer: The mountains, which served as natural barriers and boundaries, dictated the political character of Greece. From early times the Greeks lived in independent communities isolated from one another by the landscape. Later these communities were organized into poleis or city-states. The mountains prevented large-scale farming and impelled the Greeks to look beyond their borders to new lands where fertile soil was more abundant.