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In biology, '''sex''' refers to the categorization of organisms (or their parts) with regard to the role they play in reproduction. When a species reproduces sexually, it usually does so by producing two types of gametes that have to come together to form a new member of the species. One type of gamete is large and non-mobile (ova), whereas the other type is small and mobile (spermia). When an organism or an organ produces large and non-mobile gametes, it's called '''female'''. If it produces small and mobile gametes, it's called '''male'''. | In biology, '''sex''' refers to the categorization of organisms (or their parts) with regard to the role they play in reproduction. When a species reproduces sexually, it usually does so by producing two types of gametes that have to come together to form a new member of the species. One type of gamete is large and non-mobile (ova), whereas the other type is small and mobile (spermia). When an organism or an organ produces large and non-mobile gametes, it's called '''female'''. If it produces small and mobile gametes, it's called '''male'''. |