In the natural world, how does food get killed?

Plants and animals called decomposers eat away at natural waste.

Explanation:

the social historical theory explains the creation of the varnas, jats and of the untouchables. according to this theory, the caste system began with the arrival of the aryans in india. the aryans arrived in india around 1500 bc. the fair skinned aryans arrived in india from south europe and north asia.

i think it was because of how protected egyptian civilization was was which allowed them to evolve without much outside influence.