How do altruistic behaviors arise through natural selection? a) by its actions, the altruist increases the likelihood that some of its genes will be passed on to the next generation. b) the altruist is appreciated by other members of the population because their survivability has been enhanced by virtue of the altruist's risky behavior. c) animals that perform altruistic acts are allowed by their population to breed more, thereby passing on their behavior genes to future generations. d) altruistic behaviors lower stress in populations, which increases the survivability of all the members of the population.