This cell is dividing very actively.

He is very sensitive to sound.

He received the letter challenging him to a duel and began preparing for the duel.

Gender roles are an important element in defining individual behavior in society.

His role is to fulfill his responsibilities as a leader.

It is important to understand the importance of health.

Every weekend, I do volunteer work at a local shelter.

He is known as an activist for environmental issues.

He is a very active person.