Which atom, with atomic number 6, is present in all known life forms?
Earliest known life forms living below the ice of Antarctica. In December 2018, researchers announced that considerable amounts of life forms, including 70% of bacteria and archea on Earth, comprising up to 23 billion tonnes of carbon, live up to at least deep underground, including below the seabed, according to a ten-year Deep Carbon Observatory project. According to one researcher, "You can find microbes everywhere — [they are] extremely adaptable to conditions, and survive wherever they are." Fossil evidence informs most studies of the origin of life. The age of the Earth is about 4.54 billion years; the earliest undisputed evidence of life on
Earliest known life forms Australian Apex chert rocks. A life form, or lifeform, is an entity or being that is living. Currently, Earth remains the only place in the universe known to harbor life forms. More than 99% of all species of life forms, amounting to over five billion species, that ever lived on Earth are estimated to be extinct. Some estimates on the number of Earth's current species of life forms range from 10 million to 14 million, of which about 1.2 million have been documented and over 86 percent have not yet been described. However, a May 2016 scientific report estimates that