See back then farming was really important and they weren't really industrialized uuntil after the civil war.
An income is the amount of money that you make in a period of time. For an example, an annual income is the amount of money that you make in a year.
Answer: This can be necessary for test standardisation
Explanation: Test standardisation involves the process of evaluation by comparing different test results with a standard.
From the question it can be assumed that the individual that participated in the test did very well and in order for the process to publish the results, he had to compare results with other people to ensure that she the result is not a hoax.
Answer:
A sudden accident or a natural catastrophe that caused great damage or loss of life