…the state or fact of continuing to live or exist, typically in spite of an accident, ordeal, or difficult circumstances…
…a large bag made of plastic or metal foil, used in an emergency by climbers and others as a protection against exposure…
…a pack of emergency equipment, including food, medical supplies, and tools, especially as carried by members of the armed forces…
…a graph showing the proportion of a population living after a given age, or at a given time after contracting a serious disease or receiving a radiation dose…
…the property of an ability, faculty, or characteristic that makes individuals possessing it more likely to survive, thrive, and reproduce…
…the continued existence of organisms which are best adapted to their environment, with the extinction of others, as a concept in the Darwinian theory of evolution…
