The Devonian period was a very important time in the history of the Earth.

The Triassic period is one of the geological ages, referring to the period from about 252 million years ago to about 200 million years ago.

The Ordovician, an era name used in paleontology, is now called the Ordovician.

In Japanese grammar, 'n-row irregular conjugation' is a very important concept.

The Acts of the Apostles is a part of the New Testament.

He conveyed the schedule of the meeting in a three-line email.

Cats are digitigrade animals, they walk on their toes.

He learned about unguligradism in his zoology class.

His research mainly focuses on the plantigradism of mammals.

His actions were considered part of propaganda by action.