Answer: Biological altruism is a type of behavior in which an individual organism acts in a way that benefits other organisms, even at a cost to itself. This type of behavior is often seen in social animals, such as bees or ants, where individuals work together for the good of the group. The key feature of biological altruism is that it is an evolved trait, meaning that it has been selected for over time because it provides a reproductive advantage to the individual or group.