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a species on which other species in an ecosystem largely depend, such that if it were removed the ecosystem would change drastically

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is beneficial to both organisms

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is only beneficial to one and the other suffers

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a predator feeding on its prey

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fighting between two or more organisms - could be fighting over shelter, food or other resources needed to stay alive

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an association between two organisms that helps one organism but neither helps nor hurts the other organism

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a disease in which there is a severe loss of the body's cellular immunity, greatly lowering the resistance to infection

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a highly contagious viral infection of the respiratory passages causing fever and severe aching

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an infectious bacterial disease characterized by the growth of nodules in the lungs

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caused by a member of the sac fungi affecting elm trees

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a genus of heterotrophic dinoflagellates that has been associated with harmful algal blooms and fish kills

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the maximum amount of a certain organism in an ecosystem

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water, food, space, sunlight and nutrients

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movement from one location to another

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removing waste from an organism

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a way of being discrete and being hidden by blending in with a certain environment

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a learned biological behavior

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a natural behavior or certain way of doing something

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a learned behavior or certain way of doing something

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learning to identify certain locations and animals (organisms)

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a way of learning using repetition

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a way of learning using trial and error (problem solving)

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a way of learning that involves exposure to stimuli

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is a state of inactivity, typically during the winter, where heart rate body temperature, breathing, and metabolism slows

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the resting of an animal during a dry or hot period

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to attract females, males may perform display behaviors or engage in physical combat with other males

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a chemical signal put off by animals to communicate with their own kind

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some animals like dogs and wolves mark their territory using urination

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some animals fight to protect their territory. animals also use certain sounds to warn others that there is an intruder or to warn the intruder that they are in another territory. other animals will use their senses  to mark a barrier to warn others that they are intruding.

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a niche is how a certain organism reacts and lives in an ecosystem. kind of like how plants compete for sunlight and pollination.