What type of depression has a basis that is biological?

What type of depression has a basis that is biological?
What type of depression has a basis that is biological?
What are the biological facts about depression?
What are the theories of biological depression?
What is the basis for depression?
Is there a biological basis for depression?
What is the main root of depression?
Is depression a lack of serotonin or dopamine?
What happens in the brain during depression?
What is the genetic cause of depression?
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