The indus valley are believed to have been settled: -after farms failed elsewhere and farmers migrated to the valley -when the river flooded its banks and left fertile silt in which to farm -when crops such as millet were found along the banks -when the people began worshipping multiple gods

The correct answer is - when crops such as millet were found along the banks.

The Indus Valley is a valley that has a very big river flowing through it, and also very fertile soil around its banks, but it wasn't until the discovering of the millet and its nutrition value that the valley has been used for farming. Once the people recognized the potential of the millet as a big and stable food source, they started to use the advantages of the fertile valley and develop the agriculture in this part of the world.

could you use this to with a topic?

the key difference between a democracy and a republic lies in the limits placed on government by the law, which has implications for minority rights. both forms of government tend to use a representational system — i.e., citizens vote to elect politicians to represent their interests and form the government.

when a country suffers, for example, a drought period, the market product is affected for a low offer, in this case, potatoes; the government has to tax to the households, which have to give more money for the potatoes which they consume, that situation make them consume substitute goods even through loans, it could increase the financial market movement and the inflationary phenomena, the business has to increase salaries in order to the employees could buy a more expensive food (potatoes) and in order to inflation tha business had to buy expensive supplies in the factor market, while the rest of the world have to gain more money to consume the same amount of potatoes.