Male and female reproductive systems allow human reproduction. Fertilisation occurs when a sperm and egg join to form an embryo. An embryo develops into an unborn baby in the uterus during pregnancy.

Some female birds, reptiles and other animals can make a baby on their own. But for mammals like us, eggs and sperm need each other. Parthenogenesis could be the future for this California condor ...

Scientists have discovered the origins of sexual reproduction trace back to a 567-million-year-old sea creature. Over in Canada, a remarkable fossil discovery in Canada has shaken up the timeline of ...