bottom-dwelling organisms

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• Largest organisms — The largest organism found on earth can be measured using a variety of methods. It could be defined as the largest by volume, mass, height, or length. Some creatures group together to form a superorganism, though this cannot truly be classed as… …   Wikipedia

• Cambrian substrate revolution — The Cambrian substrate revolution cite journal | author=Bottjer, D.J., Hagadorn, J.W., and Dornbos, S.Q. | title=The Cambrian substrate revolution | journal= | volume=10 | date=2000 | url=http://www.amherst.edu/ jwhagadorn/publications/CSR.pdf |… …   Wikipedia

• Atlantic Ocean — an ocean bounded by North America and South America in the Western Hemisphere and by Europe and Africa in the Eastern Hemisphere. ab. 31,530,000 sq. mi. (81,663,000 sq. km); with connecting seas ab. 41,000,000 sq. mi. (106,100,000 sq. km);… …   Universalium

• Cambrian explosion — The Cambrian explosion or Cambrian radiation was the seemingly rapid appearance of most major groups of complex animals around Ma|530, as evidenced by the fossil record. [http://www.ucmp.berkeley.edu/cambrian/camb.html The Cambrian Period] ]… …   Wikipedia

• Northern hogsucker — Scientific classification Kingdom: Animalia Phylum …   Wikipedia

• lake — lake1 /layk/, n. 1. a body of fresh or salt water of considerable size, surrounded by land. 2. any similar body or pool of other liquid, as oil. 3. (go) jump in the lake, (used as an exclamation of dismissal or impatience.) [bef. 1000; ME lak(e) …   Universalium

• Lake — /layk/, n. Simon, 1866 1945, U.S. engineer and naval architect. * * * I Relatively large body of slow moving or standing water that occupies an inland basin. Lakes are most abundant in high northern latitudes and in mountain regions, particularly …   Universalium

• Common stingray — Conservation status Data Deficient …   Wikipedia

• Ocean acidification — Change in sea water acidity pH caused by anthropogenic CO2 between the 1700s and the 1990s Ocean acidification is the name given to the ongoing decrease in the pH and increase in acidity of the Earth …   Wikipedia

• inland water ecosystem — ▪ biology Introduction       complex of living organisms in free water on continental landmasses.       Inland waters represent parts of the biosphere within which marked biological diversity, complex biogeochemical pathways, and an array of… …   Universalium

• neritic zone — ▪ oceanography       shallow marine environment extending from mean low water down to 200 metre (660 foot) depths, generally corresponding to the continental shelf. Neritic waters are penetrated by varying amounts of sunlight, which permits… …   Universalium