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I'm not sure of the context for this question, but if you are looking at it from an evolutionary time-scale, close interactions cause co-evolution of the species, where they tend to develop traits that become dependent on each other. The classic example is lichen, which is composed of a photosynthetic bacterial species and a fungal species which evolved together to function almost like a single organism.

2007-04-04 11:07:35 · answer #1 · answered by formerly_bob 7 · 0 0

You may be thinking of "character displacement". That's when different species (or even males and females of the same species) who live in the same place evolve in such a way as to use different niches (i.e. select different food) so that they will not compete with each other.

2007-04-05 17:01:44 · answer #2 · answered by harpy 3 · 0 0

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