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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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commensalism

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competition
food
water
mates

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predation

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parasitism

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mutualism

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

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Dutch elm disease-  fungal disease of elm trees that is spread by elm bark beetles

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Tuberculosis- an infectious bacterial disease characterized by the growth of nodules (tubercles) in the tissues.

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Influenza- a highly contagious viral infection of the respiratory passages causing fever.

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Aids- a disease in which there is a severe loss of the body's cellular immunity

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Light

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Shelter

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Limited water supply.

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limited food supply

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the number of people, other living organisms, or crops that a region can support without environmental degradation.

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It is adaptation that helps an organism blend in with the things around it.

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The process in which the animals get rid of waste products.

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Some animals travel relatively short distances to find food or more favorable living or breeding conditions.

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habituation- the action of habituating or the condition of being habituated.

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Trial and error learning- is a problem solving method in which multiple attempts are made to reach a solution.

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classical conditioning- a learning process that occurs when two stimuli are repeatedly paired

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Imprinting- ome to recognize (another animal, person, or thing) as a parent or other object of habitual trust.

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Learned behaviors- something that an organism develops as a result of experience.

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Instincts-  natural or intuitive way of acting or thinking.

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Hibernation- is a state of inactivity and metabolic depression in endotherms.

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animals move around to find mates and food.

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Estivation- prolonged torpor or dormancy of an animal during a hot or dry period.

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a chemical substance produced and released into the environment by an animal. An animal may leave their scent to mark territory or attract other animals.

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Courtship daces- these two birds are attracted to each other.

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Oak trees grow to dominate a forest turning sunlight into food.

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Garden spiders are predators that hunt for prey among plants.

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An animal trait that helps them survive

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these tigers may be fighting over territory

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Animals will fight for their territory.

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Dogs urinate onto things to show their ownership