During the earliest years of agricultural development, allowed farms to be farther from rivers.

Irrigation.

Explanation:

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b.

developed countries have tended to improve the environment, while developing countries have tended to damage it.

because the two particles have an equal charge, the charges will cancel out and give the atom an overall charge of 0. so, if at atom has 35 protons in the nucleus, we could expect it to have 35 electrons orbiting that nucleus.