The diversity and complexity of life on Earth is astonishing: 8 million or more living species—from algae to elephants—all evolved from a simple, single-celled common ancestor around 3.5 billion years ago. But does that mean that evolution always and inevitably generates greater diversity and complexity, having a predictable direction?
Click here for original story, Evolution: why it seems to have a direction and what to expect next
Source: Phys.org