Summarize how morality develops in people?

(literally can be your opinion or something simple, less than a sentence even. god i hate this class.)

I like to use the idea of nature and nurture.

Explanation:

By nature I mean that if somebody was born a psychopath (which happens quite often) their idea of morality is warped. But what affects most of morality in general population tends to be the enviroment they grow up in and how they were raised. Whatever they encountered as children (especially) creates our understanding of the world.