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A food chain shows how each living thing gets food, and how nutrients and energy are passed from creature to creature.

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A system of interlocking and interdependent food chains.

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Parasitism is a non-mutual relationship between species, where one species, the parasite, benefits at the expense of the other, the host.

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An association between two organisms in which one benefits and the other derives neither benefit nor harm.

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Mutualism is the way two organisms of different species exist in a relationship in which each individual benefits from the activity of the other.

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The living together in more or less intimate association or close union of two dissimilar organisms.

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Decomposers are generally fungi and bacteria. Decomposers digest and decompose dead animals.

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Organisms that get their food/energy from consuming other organisms.

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Organisms that make their own food. Plants.

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The trophic level of an organism is the position it occupies in a food chain.

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By the most general biophysiological definition, the biosphere is the global ecological system integrating all living beings and their relationships, including their interaction with the elements of the lithosphere, geosphere, hydrosphere, and atmosphere.

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A group of two or more species that live in the same geographical area.

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A population is the number of all the organisms of the same group or species, which live in a particular geographical area, and have the capability of interbreeding.

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An ecological niche is the role and position a species has in its environment; how it meets its needs for food and shelter, how it survives, and how it reproduces. A species' niche includes all of its interactions with the biotic and abiotic factors of its environment.

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A habitat is an ecological or environmental area that is inhabited by a particular species of animal, plant, or other type of organism. The term typically refers to the zone in which the organism lives and where it can find food, shelter, protection and mates for reproduction.

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A biotic factor is any living component that affects the population of another organism, or the environment.

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In biology and ecology, abiotic components or abiotic factors are non-living chemical and physical parts of the environment that affect living organisms and the functioning of ecosystems.

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A large community of plants and animals that occupies a distinct region.

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A biological community of interacting organisms and their physical environment.