competition - the contest among organisms for limited resources such as food, water and shelter, limiting factor - an environmental variable that keeps a population from increasing, predator-prey - relationship where one organism kills and eats another organism, symbiosis - a close relationship between two different species that benefits at least one, instinct - a natural way of behaving that is inherited, not learned., natural cycle - a continuous series of process where matter may change form in order to be exchanged and reused by the environment or organisms., conservation - the protection and careful use of natural resources, pollutant - unwanted and harmful substance that affects the environment, invasive - a nonnative or exotic species of organism usually considered destructive, extinct - an organism with no living examples on Earth, endangered - an organism threatened by extinction,

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