Final answer:
The form of natural selection that promotes behaviors helping close relatives is called kin selection, which ensures the genes shared between relatives are passed on to future generations.
Step-by-step explanation:
The form of natural selection that promotes behaviors that help close relatives is called kin selection. Kin selection refers to natural selection that favors altruistic behaviors when those behaviors benefit the genetic relatives of the individual. This can mean that an individual might sacrifice their own life or reproductive potential to enhance the survival and reproductive chances of their close relatives, thus ensuring that the genes shared by the individual and their relatives are passed on to future generations.
One classical example of kin selection is found in eusocial insects like bees, where workers are typically sterile and assist the queen in raising other offspring. These behaviors, which might seem altruistic, can actually spread through a population because they help close relatives, who share many of the same genes, to survive and reproduce