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APES 1: Organism Interactions & Feedback
APES 1: Organism Interactions & Feedback
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15 Terms
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1
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Hermit crabs
________ make homes in shells abandoned by snails.
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feedback loop
a feedback process where an output of matter, energy, or information is fed back into the system as an input and leads to changes in that system
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positive feedback loop
causes systems to change further in the same direction; increases change to a system
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negative feedback loop
causes systems to change in the opposite direction; decreases change to a system
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examples of a positive feedback loop
melting of a polar ice cap, increased erosion due to decreasing vegetation
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examples of a negative feedback loop
reproduction -> overgrazing -> less reproduction
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competition
compete for available resources (food, mating partners, etc.); occurs between both the same and different kinds of organisms
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predation
hunt and kill other organisms to supply their energy needs; occurs between different kinds of organisms
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symbiosis
live in close association with another kind of organism; occurs between different kinds of organisms
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cooperation
live together and help each other; occurs between the same kind of organisms
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resource
anything needed by an organism for life (ex. nutrients, water, light, space)
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limiting factor
a nutrient in short supply or one that cycles slowly (LIMITS the growth of the population)
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mutualism
a relationship where both organisms benefits (ex. insects transfer pollen between plants as they gather nectar for food)
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commensalism
a relationship where one organism benefits; the other is neither harmed nor helped (ex. hermit crabs make homes in shells abandoned by snails)
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parasitism
a relationship where one organism benefits; and the other is harmed in some way (ex. ticks feed on dog’s blood)
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