According to the comparative table, what factor contributes to the small relative testis size in orangutans?

Answer

Their solitary nature leads to males and females encountering each other infrequently

The solitary social structure of orangutans means male-female contact is brief, which minimizes the need for large sperm volumes due to low levels of sperm competition.

According to the comparative table, what factor contributes to the small relative testis size in orangutans?
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