Life

Life was the state of being alive. It existed on the planet Olympus before anywhere else in the universe. However, the Olympian Prometheus stole the life spores and released them, spreading life across the rest of the universe. (COMIC: The Life Bringer!) This was known as the First Proliferation, described as "life's opening lunges from impossible planets circling frozen stars and black suns". (PROSE: The Knight, The Fool and The Dead)

The Seventh Doctor remarked that life would defeat Gavrok. (TV: Delta and the Bannermen)

When Rusty the Dalek witnessed a new star be born from the remains of one that the Daleks had previously destroyed, it became convinced that its kind's perpetual was futile as "life returns, life prevails". (TV: Into the Dalek)

On whoisdoctorwho.co.uk in late 2006, Mickey Smith recalled that when Rose returned a few months prior, she had said that she had to get back to the Doctor as it was a "life and death" situation. (PROSE: Mars)