Biology
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No, not always.
This is the case in many mammal populations, but in humans, altruism has expanded - we are kind to people even if they aren't kin. In bacterial populations, there are chemical responses that can be classified as altruistic - while they deplete an individual organism's chances of survival, they help fitter organisms in the population to survive and reproduce.
This is the case in many mammal populations, but in humans, altruism has expanded - we are kind to people even if they aren't kin. In bacterial populations, there are chemical responses that can be classified as altruistic - while they deplete an individual organism's chances of survival, they help fitter organisms in the population to survive and reproduce.
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No. Kin selection is a fairly well-accepted idea. Group selection (non-kin) is a bit more controversial. Humans have moved beyond both. Humans developed the ability to choose altruism based on reason and something beyond group selection: the good of society. That's the essence of morality. All of society is better for everyone if we all agree not to wantonly kill each other.
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"over time" - Month? Year? Century?