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If your question is true or false, my answer is True. 
Because any unnatural occurrences like building houses can change the ecosystem a lot. 
When we build a house we are destroying some animals house. 
I hope this is helpful
have a nice day

Answer: True

Explanation:

Unnatural occurences are those catastrophic events induced by humans which can exert drastic impact over the ecosystem. These may include deforestation, forest fire, intentional explosion, and others. This will result in loss of many species due to damage caused to the non-living physical environment.

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