Commensalism, a relation between two kinds of plants or animals in which one obtains a benefit (such as food) from the other without damaging or benefiting it, Competition, the active seeking after and use of an environmental resource (as food) in limited supply by two or more plants or animals or kinds of plants and animals, Ecosystem, A system comprising all the biotic and abiotic factors in an area and all the interactions among them., Invasive Species, an organism that causes ecological or economic harm in a new environment where it is not native., Mutualism, association between different kinds of organisms that benefits both, Organism, an individual living thing that carries on the activities of life by means of organs which have separate functions but are dependent on each other, Parasite, An organism that lives in or on another organism, called a host, from which it gets food and to which it is often harmful., Predator, an animal that lives by killing and eating other animals, Prey, an animal hunted or killed by another animal for food, Symbiosis, a long association or living together of two organisms of different species, Biodiversity, the variety of life in the world or in a particular habitat or ecosystem., Photosynthesis, the process by which green plants (autotrophs) and some other organisms use sunlight to synthesize foods from carbon dioxide and water., Food Webs, all related food chains in an ecosystem., Food Chain, the sequence of transfers of matter and energy in the form of food from organism to organism., Keystone Species, an organism that helps hold the system together., Population, the total number of individuals of a given biological species found in one place at one time., Abiotic, a non-living part of an ecosystem that shapes its environment., Biotic, living things within an ecosystem., Species, a group of organisms that can reproduce with one another in nature and produce fertile offspring., Primary Consumers, herbivores that eat the producers., Secondary Consumers, carnivores that feed on the primary consumers or herbivores., Resource, any necessity of life, such as water, nutrients, light, food, or space., Limited Resource, something that is needed by organisms and is not infinite in its abundance in the environment; if it is exhausted, then the organisms that need it cannot survive., Limiting Factor, a required substance that is in shortest supply and therefore limits growth or other life processes., Decomposer, a living thing that breaks down dead plants, animals or waste., Niche, the role a species plays in the ecosystem., Abundance, when there is plenty of a resource to meet all organisms' needs., Resilience, the rate at which an ecosystem returns to its original state after a disturbance., Chlorophyll, green pigment in plants that absorbs light energy used to carry out photosynthesis, Ecology, is the study of the relationships among living organisms and their physical environment.

7th Grade Ecosystems

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