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Outline of life forms

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(Redirected from Living beings) Overview of and topical guide to life forms "Lifeform" redirects here. For other uses, see Lifeform (disambiguation).
Life timeline
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−4500 —–—–−4000 —–—–−3500 —–—–−3000 —–—–−2500 —–—–−2000 —–—–−1500 —–—–−1000 —–—–−500 —–—–0 — Water Single-celled life Photosynthesis Eukaryotes Multicellular life P
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←Earth formed
←Earliest water
←LUCA
←Earliest fossils
←LHB meteorites
←Earliest oxygen
←Pongola glaciation*
←Atmospheric oxygen
←Huronian glaciation*
←Sexual reproduction
←Earliest multicellular life
←Earliest fungi
←Earliest plants
←Earliest animals
←Cryogenian ice age*
←Ediacaran biota
←Cambrian explosion
←Hirnantian glaciation*
←Earliest tetrapods
←Karoo ice age*
←Earliest apes / humans
←Quaternary ice age*
(million years ago)*Ice Ages

The following outline is provided as an overview of and topical guide to life forms:

A life form (also spelled life-form or lifeform) is an entity that is living, such as plants (flora), animals (fauna), and fungi (funga). It is estimated that more than 99% of all species that ever existed on Earth, amounting to over five billion species, are extinct.

Earth is the only celestial body known to harbor life forms. No form of extraterrestrial life has yet been discovered.

Archaea

Bacteria

Eukaryote

See also

References

  1. "life form". World English Dictionary. Dictionary.com. 2009.
  2. "life form". Online Oxford Dictionary of English. Oxford University Press. 2005. Archived from the original on 2011-08-11.
  3. Kunin, W.E.; Gaston, Kevin, eds. (31 December 1996). The Biology of Rarity: Causes and consequences of rare—common differences. ISBN 978-0412633805. Retrieved 26 May 2015.
  4. Stearns, Beverly Peterson; Stearns, S. C.; Stearns, Stephen C. (2000). Watching, from the Edge of Extinction. Yale University Press. p. preface x. ISBN 978-0-300-08469-6. Retrieved 30 May 2017.
  5. Novacek, Michael J. (8 November 2014). "Prehistory's Brilliant Future". New York Times. Retrieved 2014-12-25.
  6. "Are we alone in the universe?". NASA. March 1, 2022. Retrieved July 12, 2022.

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