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A food chain or more correctly, a food web, is a succession of organisms in an ecosystem that serves as continuation of food energy. An organism "lower" in food chain is a source of food energy (is consumed) for another organism on a "higher" level.
Example of a "food chain":
algae --> protists --> squid --> seal --> orca

In contemporary research the term food web rather than food chain is usually used. This is a more accurate description when looking at the more complex nature of food chains, that is most animals feed on more than one source. The relationship between organisms is underlined.

The line Phytoplankton --> Herbivorous Zooplankton --> Carnivorous Zooplankton --> Arctic Char --> Chapelin at the right hand side of Fig. 1 is a food chain.

Topics: Food Chain, Food Preservation, Food And Agriculture Organization...

FoodFood is any substance normally eaten or drunk by living organisms. The term food also includes liquid drinks. Food is the main source of energy and of nutrition for animals, and is usually of animal or plant origin. The study of food is called food scienc	Food preservationMain food preservation methods Method Effect on microbial growth or survival Refrigeration or chilling Low temperature to retard growth Freezing Low temperature and reduction of water activity to prevent growth Drying, curing and conserving Reduction in w	Food and Agriculture OrganizationHeadquartered in Rome, Italy, the Food and Agriculture Organization (FAO) of the United Nations programs seek to raise levels of nutrition and standards of living; to improve the production, processing, marketing, and distribution of food and agricultural
Food writingA list of some prominent writers on food, cooking, dining, and cultural history related to food. Authors: Jean-Anthelme Brillat-Savarin Jeffrey Steingarten James Beard Mrs Beeton Raymond Blanc Alton Brown Henri Charpentier Julia Child Craig Claiborne Shir	Food and Drug AdministrationThe United States Food and Drug Administration is the government agency responsible for regulating food, dietary supplements, drugs, cosmetics, medical devices, biologics and blood products in the United States. One aspect of its jurisdiction over food is	Food additiveFood additives are substances added to food to preserve it, or to improve its flavour and appearance. Some additives have been used for centuries; for example, when preserving food by pickling (with vinegar), salting, as with bacon, or using sulfur dioxid
Food and cooking hygiene	Food chain	Food coloring
Food energy	Food guide pyramid	Food quality
Food security	Foodtown	Food science

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