The study of the ways living things function.
A.Pathology
B.Anatomy
C.histology
D.Physiology

The study of the ways living things function is called physiology

Explanation:

There were several major causes of the great depression in the united states. 1. unequal distribution of wealth. there was not a large middle class. while wages were rising for the majority of workers, they were not keeping pace with the increase in the cost of living or the wealth in the hands of the industrialists and others in the upper income classes. 2. there was over speculation in the stock market, which was not regulated. many americans purchased stock on credit. this was known as margin buying. 3. increased manufacturing and agricultural output, but wages that did not keep pace for the consumers to purchase all that was produced or grown. hence, inventories increased and agricultural income remained low. 4. buying on credit, known in the 1920s as installment buying. people purchased things like refrigerators on time, and did not have money to pay for the product in the future, when the bills became due. 5. federal regulations on businesses also contributed to the cause. especially favorable to the large corporations were the taxes laws which were written to encourage business expansion. 6. banks were permitted to speculate in land and the stock market with little government regulations. 7. high tariffs and war debts spread the depression world wide. 8. the stock market crash of 1929 signaled the beginning of the great depression.
there were several major causes of the great depression in the united states.
1. unequal distribution of wealth. there was not a large middle class. while wages were rising for the majority of workers, they were not keeping pace with the increase in the cost of living or the wealth in the hands of the industrialists and others in the upper income classes.
2. there was over speculation in the stock market, which was not regulated.
many americans purchased stock on credit. this was known as margin buying.
3. increased manufacturing and agricultural output, but wages that did not keep pace for the consumers to purchase all that was produced or grown. hence, inventories increased and agricultural income remained low.
4. buying on credit, known in the 1920s as installment buying. people purchased things like refrigerators on time, and did not have money to pay for the product in the future, when the bills became due.
5. federal regulations on businesses also contributed to the cause. especially favorable to the large corporations were the taxes laws which were written
to encourage business expansion.
6. banks were permitted to speculate in land and the stock market with little
government regulations.
7. high tariffs and war debts spread the depression world wide.
8. the stock market crash of 1929 signaled the beginning of the great depression.
historians agree that there is no one cause. or even a major cause, of the great depression. there are several causes that do appear near the top on any one's list of causes for the depression. 
1. no regulation of the stock market and the practice of buying stocks on margin.
2. bank failures and no regulation of banking policies with consumer's money.
3. over production in industry caused a large inventory.
4. reduction in purchasing power of the consumer.
5. foreign economic conditions.
i hope that   a lot: )