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Competitive Exclusion Principle (Gause's principle)
When two species compete for exactly the same resources (or occupy the same niche), one is likely to be more successful. One species lives, the other is eliminated.
Character displacement (niche shift)
Result of resource partitioning, certain characteristics may enable individuals to obtain resources in their partitions more successfully.
Animal that spends most or all of its life living on another organism, obtaining nourishment from the host by feeding on tissues
Insect that lays its eggs on a host. After hatching, the eggs feed off the tissues of the host
Form of symbiosis where one species benefits while the second is neither helped nor harmed
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