Altruism 1 Biological Evolution 1 Cooperative Behavior 1 Evolutionary game theory 1 Game Theory 1 Maintenance of cooperation Monte Carlo method 1 Public goods game 1 Punishment 1 Symbiosis 1 altruism 1 article 1 controlled study 1 cooperation 1 evolution 1 evolutionary theory 1 game 1 game theory 1 public goods 1 punishment 1 symbiosis 1