wrote:
Relatively speaking, mutualism and commensulism are the exception rather than the rule.

The rule being "no interaction".

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Iterated Prisoner's Dilemma for Species
-The Iterated Prisoner's Dilemma (IPD) is widely used to study the
evolution of cooperation between self-interested agents. Existing work
asks how genes that code for cooperation arise and spread through a
single-species population of IPD playing agents. In this paper, we
focus on competition between . different species...