"Mortal being" is a phrase that refers to a living entity that is subject to death or is capable of dying. There are many synonyms for this phrase, including "human," "person," "creature," "organism," "life form," and "individual." These synonyms reflect the diversity of living organisms on our planet, from the smallest microbes to the largest animals. While each of these words carries a slightly different connotation, they all suggest an inherent fragility and vulnerability to the forces of nature. In contrast to immortal beings such as gods or spirits, mortal beings are bound by their physical bodies and are ultimately subject to the cycle of birth, life, and death.