D. the movement of people from rural areas to cities.
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<span>As a developmental researcher he divides participants in his experiments into two categories. One category is for the individuals who did not have the developmental intervention the other is for those who did. This is how he is able to test his hypotheses.</span>
Drug Therapy.
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Answer:
Weathering describes the breaking down or dissolving of rocks and minerals on the surface of the Earth. Water, ice, acids, salts, plants, animals, and changes in temperature are all agents of weathering. Once a rock has been broken down, a process called erosion transports the bits of rock and mineral away.
Explanation:
because weather is breaking down or dissolving of rocks and minerals on earth surface.