biological cycle of matter

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• Biological interaction — Biological interactions are the effects organisms in a community have on one another. In the natural world no organism exists in absolute isolation, and thus every organism must interact with the environment and other organisms. An organism s… …   Wikipedia

• biological development — Introduction       the progressive changes in size, shape, and function during the life of an organism by which its genetic potentials (genotype) are translated into functioning mature systems (phenotype). Most modern philosophical outlooks would …   Universalium

• Organic matter — Other meanings can be found at Biological material Organic matter (or organic material, Natural Organic Matter, or NOM) is matter that has come from a once living organism; is capable of decay, or the product of decay; or is composed of organic… …   Wikipedia

• Nitrogen cycle — Schematic representation of the flow of nitrogen through the environment. The importance of bacteria in the cycle is immediately recognized as being a key element in the cycle, providing different forms of nitrogen compounds assimilable by higher …   Wikipedia

• Nutrient cycle — …   Wikipedia

• Biogeochemical cycle — A commonly cited example is the water cycle. In ecology and Earth science, a biogeochemical cycle or substance turnover or cycling of substances is a pathway by which a chemical element or molecule moves through both biotic (biosphere) and… …   Wikipedia

• Phosphorus cycle — The phosphorus cycle is the biogeochemical cycle that describes the movement of phosphorus through the lithosphere, hydrosphere, and biosphere. Unlike many other biogeochemical cycles, the atmosphere does not play a significant role in the… …   Wikipedia

• Carbon cycle — The carbon cycle is the biogeochemical cycle by which carbon is exchanged among the biosphere, pedosphere, geosphere, hydrosphere, and atmosphere of the Earth.The cycle is usually thought of as four major reservoirs of carbon interconnected by… …   Wikipedia

• Human impacts on the nitrogen cycle — Agricultural and industrial nitrogen (N) inputs to the environment currently exceed inputs from natural N fixation (Galloway 2003). As a consequence of anthropogenic inputs, the global nitrogen cycle (Fig. 1) has been significantly altered over… …   Wikipedia

• Natural organic matter — (NOM) is broken down organic matter that comes from plants and animals in the environment. [ Natural Organic Matter, GreenFacts, 22 Apr, 2007 …   Wikipedia

• Hainish Cycle — The Hainish Cycle is the setting for a number of science fiction novels and stories of Ursula K. Le Guin. Most of them are not set on Hain, but have it as a rather distant background. People from Hain are often present but mostly as secondary… …   Wikipedia