AN ORGANISM IS ANY LIVING THING-AN ANIMAL, A PLANT, OR A MICROBE. THE ORGANISMS IN THIS WORLD CAN BE CLASSIFIED INTO DIFFERENT SPECIES. HUMAN BEINGS ARE A SPECIES AND SO ARE ROSES. A SPECIES IS A SET OF ORGANISMS THAT RESEMBLE ONE ANOTHER IN APPEARANCE AND BEHAVIOUR.
THE FLOWERS ABOVE ARE OF SAME SPECIES
THE ORGANISMS IN A SPECIES ARE POTENTIALLY CAPABLE OF REPRODUCING NATURALLY AMONG THEMSELVES. GENERALLY, ORGANISMS FROM DIFFERENT SPECIES DO NOT INTERBREED AND, EVEN IF THEY DO THEY DO NOT PRODUCE FERTILE OFFSPRING.