Astudent viewing a cell with a micrscope obseeves a cell wall a cell membran and a nucleus the persence of these structures idndicates thta the student is looking at a cell from a

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the wetland preservation movement began in the u.s. in earnest with the clean water act (cwa) of 1972. although not specifically written to protect wetlands, the cwa is comprised of a series of regulations designed to prevent pollutants from contaminating u.s. waters.