Add Yahoo as a preferred source to see more of our stories on Google. Photo Credit: iStock Reddit users are fixated on a post about Sacculina, a parasitic barnacle whose infection leaves crabs unable ...

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Male turtles keep their penis tucked inside the body until mating, at which point it extends dramatically. In some species, ...

Human Reproduction is a peer-reviewed scientific journal covering all aspects of human reproduction, including reproductive physiology and pathology, endocrinology, andrology, gonad function, ...

There isn’t much to connect legendary Irish writer James Joyce with some of today's favorite paparazzi targets, but in his day, Joyce complained of being hounded by the press and “feeling under siege ...

Birds do it, and bees do it. Indeed, researchers estimate that over 99.9% of eukaryotes reproduce sexually. What, then, are the true costs and benefits of sex? Yet again, this simple example ...

Narrator: A flower isn’t just a pretty thing you give to someone special. It’s actually a complicated part of a plant. It produces seeds through a process called pollination. The flower’s stamen ...

Testosterone also stimulates sperm production in the seminiferous tubules and activates the prostate gland and seminal vesicles to produce their secretions. The release of testosterone is controlled ...

Like mitosis, meiosis is a form of eukaryotic cell division. However, these two processes distribute genetic material among the resulting daughter cells in very different ways. Mitosis creates two ...

Natural selection is a mechanism of evolution. Organisms that are more adapted to their environment are more likely to survive and pass on the genes that aided their success. This process causes ...