biotic barrier

Mira otros diccionarios:

• biogeographic region — Introduction       area of animal and plant distribution having similar or shared characteristics throughout.       It is a matter of general experience that the plants and animals of the land and inland waters differ to a greater or lesser… …   Universalium

• human disease — Introduction       an impairment of the normal state of a human being that interrupts or modifies its vital functions. health versus disease       Before human disease can be discussed, the meanings of the terms health, physical fitness, illness …   Universalium

• biosphere — biospheric /buy euh sfer ik/, adj. /buy euh sfear /, n. 1. the part of the earth s crust, waters, and atmosphere that supports life. 2. the ecosystem comprising the entire earth and the living organisms that inhabit it. [1895 1900; < G Biosphäre; …   Universalium

• United States — a republic in the N Western Hemisphere comprising 48 conterminous states, the District of Columbia, and Alaska in North America, and Hawaii in the N Pacific. 267,954,767; conterminous United States, 3,022,387 sq. mi. (7,827,982 sq. km); with… …   Universalium

• South America — South American. a continent in the S part of the Western Hemisphere. 271,000,000; ab. 6,900,000 sq. mi. (17,871,000 sq. km). * * * Continent, Western Hemisphere. The world s fourth largest continent, it is bounded by the Caribbean Sea to the… …   Universalium

• Tertiary Period — Interval of geologic time, 65–1. 8 million years ago. It constitutes the first of the two periods of the Cenozoic Era, the second being the Quaternary. The Tertiary has five subdivisions: (from oldest to youngest) the Paleocene, Eocene, Oligocene …   Universalium

• Communication — For the term used in the game of bridge, see Glossary of contract bridge terms # communication. Communication is the activity of conveying meaningful information. Communication requires a sender, a message, and an intended recipient, although the …   Wikipedia

• Coral bleaching — Bleached branching Acropora sp. at Heron Island, Great Barrier Reef, in 2005 …   Wikipedia

• Atoll — For other senses of this word, see atoll (disambiguation). Satellite picture of the Atafu atoll in Tokelau in the Pacific Ocean. An atoll ( …   Wikipedia

• Crown-of-thorns starfish — On a reef in Fiji, 2005. Scientific classification Kingdom …   Wikipedia

• Late Devonian extinction — …   Wikipedia