How do behavior, morphology and physiology act in concert to improve a male's reproductive success - and why is there so much variation among outcomes within and between species? Aa Aa Aa Reproductive ...

Infertility can be a challenging and emotional time for people trying to grow their family. While primary infertility—when a couple has never conceived—is often discussed, secondary infertility can be ...

Humans are sexual, meaning that both a male and a female are needed to reproduce. Each is equipped with specific organs capable of producing specific cells needed to procreate. In conjunction with a ...