Answer: Higher rents causing displacement of existing residents.
Explanation:
Gentrification is the process of remodeling a neighborhood, street or building to increase its value and attract a population of a higher social status.
This process is highly controversial since the current inhabitants of the area usually cannot bear the costs of continuing to live in the same neighborhood and must move. Residents are sometimes forcibly evicted before remodeling.
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The variable you would need to keep track of is hight
The answer is D. Gravity.
Gravity attracts objects to the surface of the Earth. Take a falling brick, for example, the brick has more mass, therefore, there is more attraction between the brick and Gravity. The brick is a solid object and is heavier as well.
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Freezing point of the water is innate property. Therefore, I would say that the freezing point of water from 1 billion years ago would still be the same as to what temperature the water would freeze today. Thus, I choose letter D. 0°C.