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4.1b - Evolutionary Explanations for Prosocial… duration 29 minutes 1 second 4.1b - Evolutionary Explanations for Prosocial… 4.1b - Evolutionary Explanations for Prosocial Behavior	4.1b - Evolutionary Explanations for Prosocial Behavior Unit 4 (Prosocial Behavior) Lesson 1 (Theories of Prosociality) Part B (Evolutionary Explanations for Prosocial Behavior) genes reciprocity person brother reproduction fish gene selection cost sister theory hunger sort exchange likelihood bullet front brothers times idea From Tessa Dover 206 plays