All animals, including humans, are born, they get older and bigger and some will go on to have children. In the end, all animals die. We call this a life cycle. Animals are small when they start life.

Now she’s a grown up and she’s pregnant. That means that a whole new life cycle is starting… Image caption, All humans go through the same life cycle. They are small at the start of their life.

The cellular life ... cycle and its checkpoint controls allows scientists to use relatively simple model organisms to learn more about cell division in eukaryotes of all types — including humans.

Instead, life is divided into treatment cycles, appointments, and agonizing periods of waiting. Rather than marking time by ...

You’ve probably learned about the water cycle in school ... that has sustained life on our planet for millennia. However, ...