互利主义和亲族选择是两个主要理论。
Reciprocal altruism and kin selection are the two main theories.
根据互利主义理论，进化有利于为其他有机体舍弃利益以获得好感的有机体。
According to reciprocal altruism, evolution favors organisms that sacrifice their good for others in order to gain a favor in return.
关键的种间相互作用是竞争、捕食、寄生和互利共生，而主要的种内相互作用是竞争、自相残杀和利他主义。
The key interspecific interactions are competition, predation, parasitism and mutualism, whilst the main intraspecific interactions are competition, cannibalism and altruism.
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