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Relationships Among Organisms Symbiosis Terms • Ecosystem: all the organisms living in an area and everything that affects them. – Stable Ecosystem: the population sizes and available resources cycle regularly or change predictable and energy flows at a fairly constant rate. Terms • Habitat: the place where an organism lives. • Niche: organism’s role in its community. Terms • Symbiosis: an interdependent relationship between organism of two different species. – Mutualism – Commensalism – Parasitism Mutualism • Both organisms benefit. (+,+) – Each species helps the other survive. Commensalism • One organism benefits and the other is not effected. It gets no benefit and is not harmed. (+,0) Parasitism • One organism benefits (parasite) and the other organism is harmed. – The organism in which a parasite lives is called the host. – The host is NOT killed! Mimicry • One organism attempts to look like the other. • The copied organism usually has a beneficial trait, such as being poisonous Predation • Predation: Interaction in which one organism kills and eats another. – Predator: organism that obtains the food. – Prey: organism that is killed and eaten. – Example: Which is the predator and prey in this example? Predator vs. Prey Populations Competition • Competition: interaction in which two or more organisms try to use the same resources at the same time.