Plant tissue culture is a method of asexual reproduction used to produce clones of a plant with desirable traits. plant tissue culture relies on the fact that plant cells have the ability to regenerate a whole plant. single cells are dosed with certain chemicals that trigger dividing cells to produce roots, shoots, and leaves. which tenet of cell theory best serves as a basis for this type of biotechnology? a. all living things are made up of cells. b. all cells come from other cells by cell division. c. all cells are basically the same in chemical composition. d. the cell is the structural and functional unit of all living things.

from my research i have to the conclusion that decomposers, such as fungi, bacteria and invertebrates, play a critical role in nutrient cycling and without them the earth's ecosystem may not support life as we know it. elements such as carbon, nitrogen and phosphorus exist in limited amounts on earth, although huge amounts of carbon are being released into the atmosphere from underground sources now by humans. it is still extremely important that other nutrients be retained by the process of re-use. decomposers are organisms that are able to chemically break down dead material and make these elements available for use by other organisms. without this breakdown of dead material, dead bodies would pile up. so decomposers also play a role in clean up also. without them, life might not continue as we know it and dead material would overwhelm the earth.