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African elephants Streptococcus pyogenes mangrove roots, Thailand bald eagle reed frog Venus flytrap initial proposal of DNA structure carbon cycle molecular view of the cell membrane
What is the world's smallest organism?
For Students
Streptococcus pyogenes
life summary
Quizzes
Male muscle, man flexing arm, bicep curl.
Facts You Should Know: The Human Body Quiz
greylag. Flock of Greylag geese during their winter migration at Bosque del Apache National Refugee, New Mexico. greylag goose (Anser anser)
Biology Bonanza
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DNA strand illustration art, double helix, deoxyribonucleic acid, genetics
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Japanese spider crab
10 Animals With Evolutionary Traits Plucked Straight Out of a Nightmare
Spiral Galaxy type Sa-Sb or Sa/Sb in the constellation Virgo. The majestic Sombrero Galaxy Messier 104 (M104) or NGC 4594. The team took six pictures of the galaxy, stitched them together to create the final composite image. Photo from May-June 2003
9 Britannica Articles That Explain the Meaning of Life
Cell transport - illustration of a diffusion of liquid molecules through cell membrane. Phospholibid bilayer
Fast Facts about the Cell Membrane
H1N1 influenza virus particles. Colorized transmission electron micrograph. Surface proteins on surface of the virus particles shown in black. Influenza flu
10 Ways of Looking at Cells
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New York NY/ USA- November 23, 2018 Hordes of shoppers throng the Macy's Herald Square flagship store in New York looking for bargains on the day after Thanksgiving, Black Friday.
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An ancient egyptian hieroglyphic painted carving showing the falcon headed god Horus seated on a throne and holding a golden fly whisk. Before him are the Pharoah Seti and the goddess Isis. Interior wall of the temple to Osiris at Abydos, Egypt.
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Videos

What is the world's smallest organism?
Learn what defines an organism and consider two candidates for the title of world's...
Video: Encyclopædia Britannica, Inc.
See a survey comparing the largest known single living organisms on Earth: from the animal, plant, and fungal kingdoms
A survey of the largest known single living organisms on Earth, which includes representatives...
Video: © MinuteEarth (A Britannica Publishing Partner)
Why is carbon called the element of life?
Learn about carbon and how it forms the basis of life.
Video: © American Chemical Society (A Britannica Publishing Partner)

Images

African elephants
A herd of African elephants (Loxodonta africana) drinking from the Chobe...
© nicolamargaret—iStock/Getty Images
Streptococcus pyogenes
Scanning electron micrograph of Streptococcus pyogenes, associated with...
National Institute of Allergy and Infectious Diseases
mangrove roots, Thailand
Mangroves (Rhizophora apiculata) at low tide on the coast of Thailand.
C.B. Frith/Bruce Coleman Inc.
bald eagle
Bald eagle perching on a snag.
© MorningDewPhotography—iStock/Getty Images
reed frog
Reed frog perched on a lily.
© Digital Vision/Getty Images
Venus flytrap
Active traps of the Venus flytrap (Dionaea muscipula), a carnivorous plant....
© Robert and Linda Mitchell
initial proposal of DNA structure
The initial proposal of the structure of DNA by James Watson and Francis Crick, which...
Encyclopædia Britannica, Inc.
carbon cycle
Carbon is transported in various forms through the atmosphere, the hydrosphere, and...
Encyclopædia Britannica, Inc.
molecular view of the cell membrane
Intrinsic proteins penetrate and bind tightly to the lipid bilayer, which is made...
Encyclopædia Britannica, Inc.
timeline of life on Earth
Over hundreds of millions of years, life spread through the seas and over Earth's...
Encyclopædia Britannica, Inc.
Earth
The planet Earth.
NASA
animal cell
Principal structures of an animal cellCytoplasm...
© Merriam-Webster Inc.
DNA and protein synthesis
DNA in the cell nucleus carries a genetic code, which consists of sequences of adenine...
Encyclopædia Britannica, Inc.
hemoglobin tetramer
Two αβ dimers combine to form the complete hemoglobin molecule. Each heme group contains...
Encyclopædia Britannica, Inc.
paramecia
Paramecium caudatum (highly magnified).
John J. Lee
food capture: animals
The process of food capture in different animal species.
Encyclopædia Britannica, Inc.
Calvin cycle
Pathway of carbon dioxide fixation and reduction in photosynthesis, the Calvin cycle....
Encyclopædia Britannica, Inc.
basic overview of processes of ATP production
The three processes of ATP production include glycolysis, the tricarboxylic acid...
Encyclopædia Britannica, Inc.
stages of mitosis
Stages of mitosisA. Prophase. Replicated...
© Merriam-Webster Inc.
fertilization of human egg
(1) The sperm release enzymes that help disperse the corona radiata and bind to the...
© Merriam-Webster Inc.
Whittaker five-kingdom classification
The Whittaker five-kingdom classification of life.
Encyclopædia Britannica, Inc.
virus invading a cell
Virus invading a cell and reproducing.
Encyclopædia Britannica, Inc.
cyanobacteria
Cyanobacteria in a hot spring at Yellowstone National Park, Wyoming.
© Brad Pict/Fotolia
General Grant tree
General Grant tree, a giant sequoia (Sequoiadendron giganteum), among the...
© Gene Ahrens/Bruce Coleman Inc.
Arctic tern
Arctic tern (Sterna paradisaea). It breeds in the southerly reaches of the...
© Index Open
evening primrose
An evening primrose (Oenothera biennis) seen (top) in visible light and...
Thomas Eisner
epauletted fruit bat
Epauletted fruit bat (Epomophorus wahlbergi).
Bernard DUPONT
silkworm moth
Silkworm moths (Bombyx mori) mating on cocoons.
Stephen Dalton—NHPA/Encyclopædia Britannica, Inc.
major evolutionary events
The geologic time scale from 650 million years ago to the present, showing major...
Encyclopædia Britannica, Inc.
parallel evolution of marsupial and placental mammals
Parallel evolution of marsupial mammals in Australia and placental mammals on other...
Encyclopædia Britannica, Inc.
geologic time
The stratigraphic chart of geologic time.
Encyclopædia Britannica, Inc. Source: International Commission on Stratigraphy (ICS)
stromatolites
Living stromatolites in Hamelin Pool of Shark Bay, Western Australia.
© Ikonya/Shutterstock.com
Spriggina fossil
Spriggina fossil from the Ediacaran Period, found in the Ediacara Hills...
Courtesy, University of California Museum of Paleontology, www.ucmp.berkeley.edu
Michelangelo: The Creation of Adam
The Creation of Adam, detail of the ceiling fresco by Michelangelo, 1508–12;...
SuperStock
photo of Jupiter taken by Voyager 1
Photograph of Jupiter taken by Voyager 1 on February 1, 1979, at a range of 32.7...
NASA/JPL
Figure 4: Important events in the history of life.
Encyclopædia Britannica, Inc.
Tree of life illustrating the three-domain classification of life-forms
The tree of life according to the three-domain system of biological classification.
Encyclopædia Britannica, Inc.

Interactives

Plumb the depths of geologic time.
Discover how old Earth is and discover the timing of important events in Earth's...
Encyclopædia Britannica, Inc.
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