Choose all that apply. What are four reasons for the fall of the Indus Valley civilizations?

earthquakes and tectonic uplifts
decreases in trade
emigration to other countries to get jobs
recurring floods
Aryan invasions
lack of natural resources
Chinese invasions

offline recommendation systems option b

because recommendation systems produce a list of two ways

1. through collaborative filtering

or

2. through content-based filtering

1.   île de la cité

2. 200 years

3. for the nave and choir

hope im right, havent learned about this in a year