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

The internal combustion engine is an amazing machine that has evolved for more than 100 years.

It has been slowly evolving for at least six years.

But he argues that true biodiversity is found in microbes, which have been evolving for at least 3.5 billion years.

Having been evolving for 300 years, Min opera became fixed in the early 20th century.

After all, man had been evolving for a million years as a walker.

The forest evolved for about twenty years, the full program running over two hours.

The federal-state relationship has been evolving for more than 200 years.

But while conventions have been evolving for many years, so has television news.

"When I took over the school, the teaching had not evolved for 20 years," she said, speaking in French during a recent interview.