Sometimes it’s easy to tell if something is living or not. A teddy bear might look like a bear, but it cannot do any of the seven things it needs to be able to do to count as being alive.

Take the evolution of sex, for instance. To make the move from asexual to sexual reproduction, nature took a system by which parent cells reproduced simply by dividing (asexual reproduction ...

The fluids provide the sperm cells with nutrients ... A penis goes into the vagina during sexual reproduction. This is also where menstrual blood leaves the body and where a baby exits during ...

How sexual reproduction came about has long been a mystery, but an evolutionary model suggests it could have started with ...

Researchers at the Francis Crick Institute have found that the small intestine grows in response to pregnancy in mice. This ...

Cell biology is the discipline of biological sciences that studies the structure, physiology, growth, reproduction and death of cells. Research in cell biology uses microscopic and molecular tools ...

Both cells are essential components of the process ... Implications for the future of reproduction By simulating the microenvironment of mouse testes, the researchers aimed to create optimal ...