A drainage basin is any area of land where precipitation collects and drains off into a common outlet, such as into a river, bay, or other body of water. The people who live there are most often engaged in agriculture and agricultural industry, but they can also be working somewhere else. A lot of big cities are located in river basins because they are great locations for cities, sit that they can be connected with other cities on the river or other rivers (by boats...).
Answer:
i. The Delian League was formed.
ii. The Peloponnesian War began.
iii. A plague broke out in Athens.
iv. Athens lost its ruler and its power.
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Answer:
to keep the environment,animals and humans healthy and not rotten
