Interaction and Evolution

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Interaction and Evolution
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Niche
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Niche -The role an organism plays in a community
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• Two or more species cannot share the same niche

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Competition
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Competition -the type of interaction in which
organisms struggle with one another to obtain
resources
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Example

• Two lions competing over control of a herd

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Predator
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Predator - living things that eat other living
things
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Example

• A cat is a predator when it eats a mouse

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Prey
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Prey -the organisms that are eaten by predators
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Example

• A tuna fish that is eaten by a shark

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Symbiosis
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Symbiosis -a close relationship between two
organisms in which one organism lives near, on,
or even inside another organism and in which at
least one organism benefits
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Three types of Symbiosis- Commensalism-
Mutualism- Parasitism
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Commensalism
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one organism benefits and the other is not harmed
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Mutualism
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Mutualism -both organisms benefit
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Parasitism
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Parasitism -One organism benefits and the other
is harmed
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Parasite
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Parasite -lives on or in a larger organism and
feeds on it while it is still alive
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Host
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Host -an organism that is harmed by the parasite