These articles explore evolution - the changes seen in the inherited traits of a population from one generation to the next. Evolution is one of the great mysteries of biology, since it is a slow process and difficult to study.

If nature is red in tooth and claw, then "survival of the fittest" sounds like a fight to the death. Natural selection is what drives evolution. Is it true that only the strong survive?

According to DNA research, we may all have a common ancestor, an African woman who lived thousands of years ago. How did scientists reach this conclusion? Is it even possible?

Polar bears evolved to blend in with the terrain so they could hunt better. What causes one group of animals to split off from the rest of the species and develop new genetic traits?

Where did humanity begin, and how did we get to where we are now? Did we really all begin in Africa? What made us leave?

A mass extinction on Earth is long overdue, according to population ecologists. Find out what Earth's fossil record may be telling us about our future.

Have you ever seen a baby with a tail? How about a whale with legs? Believe it or not, these things happen. They're called atavisms, and they might help us figure out evolution.

Evolution is fascinating because it attempts to answer one of the most basic human questions: Where did life, and human beings, come from? The theory of evolution proposes that life and humans arose through a natural process.

We can see dinosaur and plant fossils at just about any natural museum. What exactly are fossils, though, and how do they form? Find out the answers to these questions in this article from HowStuffWorks.