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NC Science 8 standards for 8.L.3

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Population Density   number of individuals of a particular species per unit area or volume  
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Population   A group of organisms of the same species that are in close enough proximity to allow them to interbreed  
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Competition   the struggle between individuals of the same or different species for food, space, light, etc, when these are inadequate to supply the needs of all  
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Niche   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-includes all its interactions with the biotic and abiotic factors of its habitat.  
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Habitat   where an organism lives out its life- this environment can change or even disappear  
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Biotic factor   all the living things in an ecosystem  
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Abiotic factor   a nonliving part of an ecosystem  
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Microscopic   too small the be seen  
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Producer   organism that creates energy-rich compounds from sunlight (through photosynthesis)  
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Organism   a living thing, such as animal, plant or micro-organism, that is capable of reproduction, growth and maintenance.  
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Ecosystem   The combined physical and biological components of an environment; A system that includes all living (biotic factors) in a an area as well as its physical environment (abiotic factors) functioning together as a unit.  
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Classification   the assignment of organisms to groups within asystem of categories distinguished by structure, origin, etc. The usual series of categories is phylum (or, especially in botany, division), class, order, family, genus, species, and variety  
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Biodiversity   The variety and variability among living organisms and the ecosystems in which they occur. Biodiversity includes the number of different items and their relative frequencies;  
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Decomposer   an organism that feeds on and breaks down dead plant or animal matter, thus making organic nutrients available to the ecosystem  
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Consumer   an organism that eats other organisms to obtain energy rather than producing its food through photosynthesis  
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Species   all organisms that can mate with one another and to produce fertile offspring  
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Terrestrial   pertaining to land  
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Aquatic   pertaining to water  
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Freshwater ecosystems   habitats that are based in lakes, ponds, and streams  
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Saltwater ecosystems   marine ecosystems that make up approximately 75% of Earth's Surface  
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Food web   pictorial representation of the relationship amongst producers and consumers in an ecosystem  
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Food chain   an example of the transfer of energy from the sun's energy, through producers to consumers  
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Predator   animal that kills and eats other animals  
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Prey   animals that are hunted and killed by predators  
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Symbiosis   means "living together"; relationships in which interactions benefit long-term survival of one or both species  
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Commensalism   a symbiotic relationship in which one species benefits and the other species is neither harmed nor benefited  
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Mutualism   a symbiotic relationship in which two organisms live in close association with one another and both species benefit from the association  
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Parasitism   a symbiotic relationship in which one organism receives benefits at the expense of the host organism  
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Photosynthesis   process used plants and other autotrophs to capture light energy and use it to power chemical reactions that convert carbon dioxide and water into oxygen and energy-rich carbohydrates such as sugars and starches  
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Heterotroph   an organism (as an insect, bird, fish, or human being) that cannot make its own food and must obtain it by eating other animals or plants  
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Autotroph   an organism (as a plant) that can make its own food from substances that do not come from other living things  
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Ecology   scientific study of interactions among organisms and between organisms and their environment  
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Ecologist   a biologist who studies the relation between organisms and their environment  
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Carbon cycle   Cyclic movement of carbon in different chemical forms from the environment to organisms and then back to the environment.  
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Carnivore   Organism that obtains energy by eating animals.`  
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Herbivore   Consumer that eats only producers  
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Omnivore   Consumer that eats both producers and consumers  
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Carrying capacity   largest number of individuals of a population that a environment can support  
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Limiting factor   any biotic or abiotic factor that restricts the existence, numbers, reproduction, or distribution of organisms.  
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Carbon sink   Places of carbon accumulation, such as in large forests (organic compounds) or ocean sediments (calcium carbonate); carbon is thus removed from the carbon cycle for moderately long to very long periods of time.  
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Nitrogen cycle   the process in which nitrogen circulates among the air, soil, water, plants, and animals in an ecosystem  
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Carcass   Dead bodies  
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Carrion   The flesh of the carcass  
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Competition   when two organisms have the same role in an ecosystem and need to compete for some necessity of life  
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Detritivore   eats decaying animal and plant material, as well as detritus (worms, millipedes, etc.), moves from food source to food source, help in the process of decomposition  
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Decomposers   consume dead and decaying organisms, live on their food  
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Why do arrows point to the consumer in a food chain?   to show the energy movement in the food chain  
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