This inorganic compound plays an important role in chemical reactions.

The study of organic compounds is an important field in chemistry.

Health is very important.

His opinion is very important.

This compound was made by the chemical combination of two different elements.

These two elements chemically combine to create a new substance.

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

He attended a class on dissection.

He is an expert in somatology, with a deep knowledge of the functions of the human body.

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