What makes someone self-centered? and what makes someone depressed?

(i really need to know this, cause my adopted sister is self-centered)

Self-centered people can be empathic.There's no one reason why people get depressed

yes peace and development are complementary to each other since they both undergo a great deal of getting where they want to go whether its peace in general and. development

answer; bona fide occupational qualification; (bfoq);