If you were given a cylindrical structure cut from part of plant how could you tell whether it was a piece of stem or a piece of root a:with the naked aye
b: with the aid of a microscope or hand lens

the answer to your question is tooth decay.

yo

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.