If you look around , you will find a large variety of living organisms . It might be plants, animals , birds, fishes, etc...There are also many organisms which we can't even see with our naked eyes. But they are all around u. If one just make the area that he make observations in, he might get a more number of living organisms. If one just look in to a dense forest from surrounding places around his house, he could find a large number of organisms in. Each, different kind of plant, organism, animal that u see represents a species. The number of species that are known, and described range between 1.7-1.8 million. This refers to biodiversity or the number and type of organisms present on earth.