Some animals, including salamanders, have the ability to regenerate even if their limbs are severed. Researchers have discovered that cartilage in human joints has regenerative capabilities similar to ...

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.

A baby's body has about 300 bones at birth. These eventually fuse to form the 206 bones that adults generally have, according to the Nemours Children's Health System. But no matter the age of an ...

The body is, for all intents and purposes, an extraordinarily complex machine. This requires a multitude of parts all working together in complicated relationships from the micro- to macromolecular ...