Someone who is altruistic is excessively deferential and always trying to please others. Your altruistic best friend fetches you sodas, does your homework, and lends you her favorite clothes. You should really tell her to cut it out.
People who have altruistic behavior tend to be able to form strong personal relationship with other people and make them generally well-liked in a society.
Because of this, they tend to be surrounded by strong groups who are willing to help them in case they are facing any troubles and protect them from danger.
This will increase their survivability along with the likelihood that some of its genes will be passed on to the next generation.
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