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Relationships Among Organisms Biology EOCT Review
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Habitats and Niches Habitat : the place where an organism lives (WHERE) Forest is a common habitat for squirrels Many species of organisms can share the same habitat The resources (food, water, and shelter) that a habitat provides can be divided into different niches. Niche : an organism’s role in its community; include what it eats, where it is in the food change, where it feeds (HOW)
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Habitats and Niches
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Symbiosis Symbiosis is an interdependent relationship between organisms of two different species. The three types of symbiosis are: mutualism, commensalism, and parasitism. Mutualism : symbiotic relationship where both species benefit Example: Sea anemones (+) and clownfish (+)
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Symbiosis Commensalism : a symbiotic relationship in which one organism benefits and the other neither benefits nor is harmed Example: Remora (+) and sharks (0) Parasitism : a symbiotic relationship in which one organism benefits and the other organism is harmed Example: tapeworms (+) and dogs (-)
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Predation Predation : an interaction in which one organism kills and eats another Predator/prey relationship cause population cycles The organism that gets the food is the predator The organism that is killed and eaten is called the prey
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Competition Competition : is an interaction in which two or more organisms try to use the same resources Competition can occur within species (intraspecific competition) or between different species (interspecific competition)
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