Beta-carotene is an important antioxidant for the human body.

Beta-carotene is an important antioxidant for the human body.

The structure of the human body is very complex.

Health is very important.

His opinion is very important.

He is fighting against illness.

What is this material made of?

Oxidation is a type of chemical reaction where a substance reacts with oxygen to form an oxide.

This compound turns red when it oxidizes.

He decided to become a subject of the human experiment for the new drug.