In contrast to reading passage, which emphasizes the true picture of altruistic behavior, the lecturer challenges the previous belief of the altruism. The professor disagrees with text about the altruistic sentinel behavior which helps ensure survival of other members of other meerkat 's group, through the new finding of meerkat eating behavior.
The passage explains that altruism is opposite of selfiness, altruistic behavior makes an individual sacrifices for others. For instance, when sentinel meerkat see a predator that approaches toward the group, it raises alarm and alert the other members of the group to run while they are searching the food. The sentinel meerkat gains nothing and put itself in danger. However, the professor points out that sentinel meerkat eats before to stand guard for other members of the group, and meerkat find it easier to run than rest of the members.
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For extreme case, those individual who gave their kidney to stranger, receive some reward and appreciation from the world.
Finally in contrast to the reading passage claim that altruism is opposite of selfiness and gains nothing, whereas the professor reminds that is not the case, the altruistic individual too gains some reward for his act to save