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Female reproductive structure and function in humans.
A colourful male guppy courting a female guppy: What are the influences of mate selection by female
Darters such as this male greenside darter form a diverse and distinctive subfamily of fishes within
A recent study found that female baboons that groom each other are more likely to come to each other
Male and female plants
When cats mate, the tomcat (male) bites the scruff of the female's neck as she assumes a positi