https://www.khanacademy.org/humanities/oer-project-big-history/xc3079f0f2dd307e4:life/xc3079f0f2dd307e4:origins-of-life-3-2/a/article-what-is-the-biosphere 2025-08-13T00:49:52.439041008Z What Is the Biosphere? There are millions of species that live on Earth, but why do they mostly reside in a relatively small area of the planet? article