University of Manchester scientists have discovered significant concentrations of microplastics in the male reproductive system of sea ... organs of both male and female turtles, including the ...

Why does the peacock have ... he will take away reproductive opportunities from other males, leading to a high reproductive variance among males. A successful female, on the other hand, will ...

The male and female reproductive system The male reproductive system makes many sperm and can deliver it into the female reproductive system. The female reproductive system makes and releases ova.

Aa Aa Aa A mating system describes how males and females ... which may negatively impact the female's reproductive output. The importance of male mate choice is controversial.