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Examine a rag worm crawling in sand and a close-up of its gills

Examine a rag worm crawling in sand and a close-up of its gills

Nereis crawling on sand, displaying gills
Encyclopædia Britannica, Inc.
  • Encyclopædia Britannica, Inc.
    Overview of the dodo.
    What Happened to the Dodo Bird?
    What Happened to the Dodo Bird?
  • Encyclopædia Britannica, Inc.
    Colors result from the electromagnetic radiation of a range of wavelengths visible to the eye.
    How Color Works: Hue, Saturation, and Pigment
    A purple and pink flower in a field.
  • Encyclopædia Britannica, Inc.
    The land iguana (Conolophus), a species endemic to the Galapagos Islands.
    Observe a land iguana, its burrow, and its herbivorous diet of cactus flowers, roots, and stems
    Observe a land iguana, its burrow, and its herbivorous diet of cactus flowers, roots, and stems
  • Major funding for this expedition was provided by NOAA Ocean Exploration Program and NOAA Vents Program; video clips edited by Bill Chadwick, Oregon State University/NOAA
    Tiny pandorae worms (Paralvinella pandorae) living on the white tubes of the larger tube worms near hydrothermal vents of the northeastern Pacific Ocean.
    Watch how tiny pandorae worms live on the white tubes of the larger tube worms near hydrothermal vents of the northeastern Pacific Ocean
    Watch how tiny pandorae worms live on the white tubes of the larger tube worms near hydrothermal vents of the northeastern Pacific Ocean
  • Encyclopædia Britannica, Inc.
    A jellyfish contracting its body.
    Study a jellyfish's muscular contractions and learn how the carnivore uses its tentacles to catch prey
    Study a jellyfish's muscular contractions and learn how the carnivore uses its tentacles to catch prey
  • Encyclopædia Britannica, Inc.
    Learn what defines an organism and consider two candidates for the title of world's smallest organism—the bacteria Carsonella ruddii and Mycoplasma genitalium.
    What is the world's smallest organism?
    What is the world's smallest organism?
  • © American Chemical Society (A Britannica Publishing Partner)
    Learn about carbon and how it forms the basis of life.
    Why is carbon called the element of life?
    Why is carbon called the element of life?
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