QUOTE : There a re more than 500,000 types of plant in the world. And each species possesses its own special planning within itself and features particular to that species. Together with the same perfect basic systems found in all of them, there is also an unparalleled diversity in terms of re p ro d u c t i v e systems, defence mechanisms, colour, and design. The only unchanging thing in all this is the reality that the parts of the plants (leaves, ro o t s , stems) and many other mechanisms, must exist at once and with no defects so that the general system, the body, can function.