Introduction Chewing gum in various forms has been around since ancient times. The Greeks chewed sap from the mastic tree, called mastiche. On the other side of the world, the ancient Mayans favored the sap of the sapodilla tree (called tsiclte).
Bioremediation is a waste management technique that involves the use of organisms to remove or neutralize pollutants from a contaminated site.ioremediation may occur on its own (natural attenuation or intrinsic bioremediation) or may only effectively occur through the addition of fertilizers, oxygen, etc., that help encourage the growth of the pollution-eating microbes within the medium (biostimulation).
Passive transport is the movement of molecules down a concentration gradient (from high to low concentration). Molecules move by random thermal movements. The three different types are simple diffusion, osmosis, and facilitated diffusion. This process does not require energy and the molecule that are transported are moving towards equilibrium.