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Certainty of paternity plays a crucial role in shaping mating systems, as it affects male investment in offspring and female reproductive strategies. In species where paternity is uncertain, males may compete for access to multiple females to increase their reproductive success, leading to polygamous systems. Conversely, high paternity certainty often encourages monogamous arrangements, where males can be more confident in their genetic contribution to offspring, promoting parental investment. Thus, the degree of paternity certainty can drive the evolution of diverse mating strategies in different species.

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