The female chooses. Peregrines generally mate for life, returning each year to the same area and even the same nest. However, the female will accept a new mate if the first is killed. There’s ...

This is what’s called the ‘life cycle’. All animals change during their life cycle but at different speeds. Some of us don’t change that much, we just get bigger and change our shape a bit.

There is, furthermore, a persistent feeling that the life cycle concept adds luster and believability to the insistent claim in certain circles that marketing is close to being some sort of science.

The cellular life cycle, also called the cell cycle, includes many processes necessary for successful self-replication. Beyond carrying out the tasks of routine metabolism, the cell must duplicate ...