It is expected to modify the word "natural" to "supernatural" to make the sentence true.
What are psychological disorders?
Psychological disorders (e.g.. anxiety disorder) are mental problems caused by the failure of cognitive skills.
In the past, it has been believed that psychological disorders were caused by supernatural forces, which is not scientific point of view
In conclusion, it is expected to modify the word "natural" to "supernatural" to make the sentence true.
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