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Exam Review Chapter 4
Ecosystems and Communities
7
Biology
9th Grade
05/24/2014

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Term
What is a niche?
Definition
Organisms job in the habitat
Term
What is a habitat?
Definition
Area where organisms live including abiotic and biotic factors.
Term
What are the three types of symbiotic relationships?
Definition
Mutualism, Parasitism, Commensalism.
Term
Mutualism?
Definition
Both species benefit.
Example- Sea anemone and clownfish
Term
Parasitism?
Definition
One organism benefits at the expense of the other.
Example- intestinal tapeworms
Term
Commensalism?
Definition
One organism benefits and the other is neither harmed not helped.
Term
What is primary succession?
Definition
Succession that begins in an area with no remnants of an older community.
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