He developed the theory of evolution that life on Earth developed through the process of natural selection.

VOA: special.2009.12.16

There's a short story by the science fiction writer Orson Scott Card, where the basic point of the story is that of all the life forms in the universe, we, here on Earth, are the only ones that are mortal.

科幻作家Orson，Scott，Card写了一个短故事，该故事的主旨是,在宇宙的所有生命形式中，我们，在地球上是唯一终有一死的生命。

耶鲁公开课 - 死亡课程节选

They are the reason for the many different kinds of life on Earth.

VOA: special.2009.12.01

The researchers say their findings support the idea that a huge explosion or explosions caused fire and pressure powerful enough to kill off life on the Earth.

VOA: special.2009.01.20

"His extraordinary life on this earth has come to an end," "The extraordinary good that he did lives on."

VOA: standard.2009.08.26