Some individuals sacrifice themselves to protect their relatives. What evolutionary theory explains how self-sacrifice can be adaptive?

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The theory of inclusive fitness explains how self-sacrifice can be adaptive. It suggests that organisms can increase their overall genetic success by helping their relatives survive and reproduce, as they share some of their genes. Therefore, sacrificing oneself to protect one's relatives can increase the chances of passing on genes to the next generation.

Some Individuals Sacrifice Themselves to Protect Their Relatives