The observable physical differences between males and females, especially biological differences related to human or sexual reproduction are referred to as sexual dimorphism.
Sexual dimorphism is a systematic difference between characteristics of individuals of opposite sexes belonging to the same species.
Let's take this, for example, in mammals male individuals are larger in size as compared to female individuals.
Similar is the case with other species such as spiders also exhibit sexual differences between males and females.
In spiders, females are larger in size than males.
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