The first Clean Water Act of 1972 was significant because it

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answer is

human impact on the environment can be seen in the deterioration of the !

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silty loam

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the answer is z.

the human body has five levels of organization. level 1: cells. cells are the basic units of life and form the first level of organization. cells in the human body have specific functions. examples include nerve cells, blood cells, liver cells, and so on.