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Definition

it would lead to upper respiratory infections and pneumonia.

the correct answer is:

a population changes in response to a change in the environment.

here is the answer

water, ice, acids, salts, plants, animals, and changes in temperature are all agents of weathering. weathering is the breaking down or dissolving of rocks and minerals on earths surface. once a rock has been broken down, a process called erosion transports the bits of rock and minerals away.