"But I've never heard of such a thing evolving independently."

But the present government is making an effort to keep the planet evolving independently, with its own culture.

The structures are thought to have evolved independently many times.

Then each branch continued to evolve independently for at least six million years.

These complex structures would have been independently evolved a number of times.

Communities evolve independently and without influence of authority or government.

At some point, scientists believe, the two lines split and evolved independently.

They have evolved independently approximately 40 times and are considered a key innovation.

True carnivory has probably evolved independently at least six times.

Mouthbrooding has evolved independently in several different families of fish.