Continental drift is the geological phenomenon in which continents move. These movements at speeds of a few centimeters per year can actually be measured since the advent of satellite geodesy. The movement of continents is caused by plate tectonics.
Alfred Wegener noted at the beginning of the 20th century that the edges of some continents (particularly South America and Africa) are similar in shape, concluding that the continents were connected and separated before. The problem was that it was not known how huge land masses could move across the Earth's surface. Such a movement requires enormous power and it was not known where it came from.
Later it was known that, according to plate tectonics, the continents move as a result of convection currents in the mantle. They slowly move away from each other, bump into each other, slide under each other, or rub against each other. This causes various surface phenomena, such as earthquakes, volcanism, and slow changes, such as subsidence, mountain building and the displacement of continents.
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The "bi" in the word "bicameral" refers to the number 2: a bicameral legislature features two legislative bodies (the correct answer is D).
A legislature with one body would be called "unicameral".
Most legislatures only have one or two bodies, so the other words are not often used (and especially 100 legislative bodies would not be feasible to maintain).
Barter system- A method of exchange when no money is involved.
B and C can't be the answers because they are not exchanging anything.
D can't be the answer either because there is money involved.
So your answer is A) You trade an apple for a banana at school. because you are exchanging something with someone for something else thats not money.
Hope this Helps!!
B. is the answer for the question
I believe the answer is:<span>the government can change real output </span> <span>only by making unexpected changes in aggregate demand.
Without making the unexpected changes, the market would most likely anticipate the movement of market equilibrium and adjust that output to obtain maximum profit. Because of this, the government has to utilize the element of surprise that prevent the people on the market to create their adjustment</span>
