OVA is an acronym for 'Original Video Animation, ' which is a type of animation that is released directly to the public on video or DVD, rather than being broadcast on television. It is often used to create anime series and movies, and is a popular source of entertainment in Japan. SOURCES LIFE is a term used to refer to the sources of life, such as food, water, air, and shelter. These are essential for sustaining life, and are necessary for humans to survive.