What happens when a group of animals become extinct?

It impacts other species and the ecosystem itself.

Explanation:

If a species has a unique function in its ecosystem, its loss can prompt cascading effects through the food chain

a

explanation:

2686-2181 bce-- "egyptian civilization developed along the nile river in large part because the river’s annual flooding ensured reliable, rich soil for growing crops."

1069-664 bce-- "ancient egyptians developed wide-reaching trade networks along the nile, in the red sea, and in the near east."