The Berlin wall is a Relic Origin Boundary.
Answer: Relic Origin Boundary
Acid rain from Los Angeles changed the chemistry of the river, resulting in the death of many fish.Due to human activities in Los Angeles, pollution is not anymore shocking. The acid rain would be distributed to the river which would change the environment of the aquatic life.
If you have choices, it would be really helpful if you'd include them with your question, but I'd say
More than half of the forests in the Czech Republic have been destroyed by pollution.
United States Constitution was ratified in 1789, but had not much without a very considerable debate. During Constitutional Convention, delegates debated major issues such as the makeup of the legislature and the effect of slavery on representation.
