Living organisms do not live forever. There comes a time, when an organism dies. Death can be caused by a number of factors such as diseases, accidents, predation, starvation or pollution. If organisms do not die due to such factors, they eventually die because of old age. Death of every individual organism is a certainty (i.e., no individual immortal), still life continues. There must be some process in living organisms that ensures this continuity. The process that ensures continuity of life is referred as reproduction. It is necessary for the continuation of life and to compensate for the loss of life due to death. The statement ‘nothing lives forever yet continues’, explain the role of reproduction in nature.