Which environmental change played a key role in making human survival easier and bringing about the Neolithic age? A.
decline in global sea level
B.
end of the Ice Age
C.
extinction of mammoths
D.
increase in cave formations

offline recommendation systems option b

because recommendation systems produce a list of two ways

1. through collaborative filtering

or

2. through content-based filtering

these civilizations were located around fertile rivers, where they could produce an abundance of crops

answer:

it caused mass african migration, african populations to grow, african empires to topple, and racism against slaves to emerge.

use wikipedia, i think they have this.