Certainly, countless species have adapted to past climate fluctuations.

They are also key water catchments, help clean the air and are home to countless species.

Amazingly Vivid Dino Illustrations Reveal a Brutal Prehistoric World Over its lifetime, Earth has hosted countless species.

The Amazon is home to countless species of catfish, and several tiny, virtually transparent species have been labelled as candirus over the years.

Humanity, one of the countless species forming the biosphere, can perturb it, but we cannot leave it or destroy it without perishing ourselves.

The number of specimens in all our museums is absolutely as nothing compared with the countless generations of countless species which have certainly existed.

Countless species of animals perished in this cataclysm of ice and snow, but man survived.

"Since your time, countless species have evolved right across the galaxy," Inigo said.