Oxygen, which is one of the chemical elements, is necessary for us to breathe.

I am an Earthling.

We are searching for extraterrestrial life.

The process of terraforming is part of transforming other planets into a habitable environment for humans.

Earth science is an important field of study for unraveling the mysteries of nature.

The term 'Eta' symbolizes historical discrimination and should not be used in modern society.

Taki is my best friend.

More or less, we all agree with his opinion.

In learning Japanese grammar, understanding the upper two-step conjugation is important.

It takes twenty minutes to get to my house.