Without the annual , people never could have settled in Egypt

The answer for this is floods.

Explanation:

You can also consider some words similar to floods such as flooding.

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Without the annual floods, people never could have settled in Egypt

interdependence is when all participating groups and individuals depend on each other. if you depend on one anothers goods, you end up trading in order to get the items you're looking for. (for ex: if i have food and you have water, we trade in order to depend on each other to live)

the puritans were a group of people who grew discontent in the church of england the common unity strengthened the community.