The fact that dirt and contamination were threats to our ancestors suggests:

It may help with awareness or obsessive - compulsive disorder

Explanation:

answer

car dealerships cannot obtain stock

explanation

recession is a period in the economy of a nation or a state   when there is temporary economic decline that is when people produce and spend less. that is industrial activities are reduced.it can be caused by increased unemployment which leads to less growth and a drop in consumer spending which affects businesses. during this period business sales and revenues decrease thus causing businesses not to expand this is because the demand goes down and the businesses start reporting loses.