NEED ASAP One aspect of the Commercial Revolution was that the barter system of trade was replaced by a system based on money and credit. Why were Arabic numerals needed to make this system work?

A) Arabic numerals could be written in bank books without filling up the page.

B) Arabic numerals included the number 0, which does not appear in Roman numerals.

C) Arabic numerals were easier for everyone to learn and use in transactions.

D) Arabic numerals allowed bankers to more easily calculate the interest on a loan.

food chain i would say only because there is competition on getting food and survival

answer: the time zones used to be whatever the local authority wanted them to be. one town might have 6am whenever the sun came up and another town had 6am 10 minutes later.  

the trains had a hard time when their orders said to be at a certain point at 6am.  

6am, but who's 6am.  

the railroads got together and set the time zones more or less along the longitude lines across the country.

explanation:

impeachment is when a president is committing treason or doing shading acts while in presidendcy therfor he can be impeached   by congress

a 3 branch government