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+ If we ignore the affects of temperature on fertility of an organism
1) Is there any evolutionary advantage / disadvantage of descended testes or presence of a scrotal sac ?
2) Is there any evolutionary advantage / disadvantage of non descended testes or absence of a scrotal sac ?
only one i can think of is that descended testes in scrotums can be easily damaged in some accident and the person can immediately lose his biological rights to being a father