Immortality is the concept of eternal life. Some species possess 'biological immortality' due to an apparent lack of the Hayflick limit.
The Fountain of Eternal Life in Cleveland, Ohio, United States, is described as symbolizing "Man rising above death, reaching upward to God and toward Peace."
Adam and Eve condemned to mortality. Hans Holbein the Younger, Danse Macabre, 16th century
Representation of a soul undergoing punarjanma. Illustration from Hinduism Today, 2004
Biological immortality is a state in which the rate of mortality from senescence is stable or decreasing, thus decoupling it from chronological age. Various unicellular and multicellular species, including some vertebrates, achieve this state either throughout their existence or after living long enough. A biologically immortal living being can still die from means other than senescence, such as through injury, poison, disease, predation, lack of available resources, or changes to environment.
Hydra
Polycelis felina, a freshwater planarian