Answer:
Athenian democracy developed around the 6th century BC in the Greek city-state (known as a polis) of Athens, comprising the city of Athens and the surrounding territory of Attica. Athenian democracy is often described as the first known democracy in the world. Other Greek cities set up democracies, most following the Athenian model, but none are as well documented as Athens' democracy.
Explanation:
The answer is b.
Plants, specifically trees, are the best defense against erosion. The trees planted in the soil prevent the land from eroding due to excess water.
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Between 50-80 years or even more than 80 sometimes
The answer Ural Mountains I think I spelled it right-