The main cause was the Stock Market Crash of 1929.
Because it is important to know the composition of the object
Density is the ratio of the mass of a sample to the volume occupied by that mass, and expresses how much mass there is per unit volume of a given portion of matter. Density is a physical property of extreme importance in the characterization, identification and use of substances or materials.
Although there are several organizations whose sole function is to provide humanitarian aid around the world, one of the more popular ones would be "UNICEF"
I would say the best three answers for this question are <span>B. A high cost to society for education C. An increase in the general risk of getting an STD/STI D. Economic costs. Generally, STIs/STDs do not have a positive affect on anything</span>
<span>it helped the islamic empire expand without using violence. </span>