Which of these factors does not significantly affect our wellness?

Base on my research here are the choices of your pasted question:
A.
number of siblings
B.
heredity
C.
environment
D.
culture
We'll hereditary, environment and culture are all factors that has a high significance of effect in our health, except letter A. number of siblings. 
The number of your siblings has no effect on your health.

Depression is lifelong, though you can get medication to with it. the difference between sadness and depression is that sadness lasts a little bit, depression last a long time and it goes on and off. people usually get depression through experiences they have been through, or genetics.

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