Answer:
Biological; cognitive; behavioral
Explanation:
Depression is very common in our modern society. There are several factors underlaying it. There are biological, cognitive and behavioral factors that leads to depression in humans.
The cognitive behavioural perspective of depression are simply disorders arise from maladaptive learned behaviour. The interaction of environment and subjective experience is important in this case.
The major depression characteristics includes feeling sad and helpless everyday for weeks and includes the following characteristics: little energy
feelings of, worthlessness/hopelessness, suicidal thoughts, difficulty sleeping
difficulty concentrating. Etc.