Kin selection is the evolutionary strategy that favours the reproductive success of an organism's relatives, even at a cost to the organism's own survival and reproduction. Kin altruism can look like altruistic behaviour whose evolution is driven by kin selection.
In kin selection, an organism is willing to expose itself to danger in order to help others with the same genes survive. Since the genetic material of the individual is most closely shared with relatives, performing helping acts toward those individuals helps ensure that these genes will survive. This is an evolutionary benefit because altruism in individuals helps their genes survive whether the individual does or not. A group composed of more selfish individuals would be at a disadvantage as a group because each individual’s fate would be solely in one’s own hands.
The first sentence is referring to a secondary reinforce while
the second sentence is referring to primary reinforce. A primary reinforce are
usually base on biological things such as the water we drink or food that we
eat while the secondary reinforce is base on the conditions that humans is
reinforcing such as money or grades.
