Why does an injured area hurt? a) increase temperature in the area stimulates pain receptors
b) histamine stimulate pain receptors
c) swelling in the area stimulates pain receptors​

I think the answer is A because of the temperature change on the area

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.

Ibelieve it's choice d.