Which behavior involves cost to the actor?
altruistic reflects key principle in quiz on animal behavior+pyqs, where evolutionary mechanisms shape genetic variation and adaptation. In this context, altruistic aligns with experimental and theoretical evidence from population genetics, behavioral ecology and molecular phylogeny. Textbooks like Campbell Biology, Futuyma Evolution and Hartl Principles illustrate supporting data. Understanding why altruistic fits helps integrate natural selection, environment.
Ref: Alcock, Animal Behavior, Kin Selection and Social Behavior.