The answers can't fit in here so you can find them all in this attachment.
By the late 1960s, people were declaring that “Lake Erie is dead.” The lake was heavily polluted with factory pollutants and sewer waste. ... As pollutants increased in the water, so did phosphorus and nitrogen levels, which led to the development of algal blooms.
Answer: Trade made the city-states wealthy. Many were successful and powerful because they specialized and were located in the middle of trade routes. Venice was the most powerful Italian city-state and it specialized in shipping allowing it to control the trade routes in the Mediterranean Sea.
Answer:
They started to rely on themselves more and less on international trade.
Explanation:
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The Senate refused to ratify the treaty of Versailles primarily because they objected to the League of Nations. If the US joined the League, then they would be obligated to fight in future wars and the Senate didn't want that.
