Because there is no science that supports the claim that there are <span>special sunglasses that allow differing amounts of light to the left or right eye and thereby helping to treat mood disorders</span><span>, these special sunglasses demonstrate the principle of </span>extraordinary claims. Extraordinary evidence is required in order this statement to be true and proofed.
Answer:
option A
Explanation:
the correct answer is option A
In the early period of time barter system is used in which goods were exchanged with goods.
If you want to buy an article then you can do it with the help of money and if you want to sell that article that also you can do with the help of money so, we can say that money is a medium of exchange.
Items such as knives, tobacco and blankets were traded for
guns, gunpowder and other items. In
short, what items were useful for survival were the items people often traded
with. They had to have purpose in the
frontier for the items to be of value.
