Outline of life forms

A life form or lifeform is an entity or being that is living.

Estimates on the number of Earth's current species 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. More recently, in May 2016, scientists reported that 1 trillion species are estimated to be on Earth currently with only one-thousandth of one percent described.

More than 99% of all species, amounting to over five billion species, that ever lived on Earth are estimated to be extinct.

Organisms whose cells contain complex structures enclosed within membranes

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