Answer: Development of irrigation systems to provide food for themselves
Explanation:
The Indus River valley achievements could be seen in how they developed their irrigation system to provide food for themselves. Enlisted are the following achievements they made;
1) They developed a uniform weight and measures.
2) They were the first to bring about urban sanitization systems.
3) Transportation and trade was their major goal
4) Their art was highly advanced.
Here's a small list of popular books that can help and introduce you to Ancient India. They are all available in English, by the way.
1- "A History of India, vol. 1: From Origins to 1300" (Romila Thapar)
2- "Ancient India as Described in Classical Literature; Being a Collection of Greek and Latin Texts Relating to India, Extracted from Herodotus and Other" (John Watson McCrindle)
3- "The Philosophy of Ancient India" (Richard von Garbe)
4- "Ancient India: in Historical Outline" (D.N. Jha)
5- "The Ancient Geography Of India" (Alexander Cunningham)
Timber his correct I just took the test
The whole amount of currency need to be the same.
In respect to this question, there are no options given to choose from. So i am answering this question on the basis of my knowledge and i hope that it helps you. Some states have enacted a Balanced Budget Amendment to their state constitution, which require them to hold spending in line with revenues.