This substance is a solid.

What is this material made of?

The air in this area is greatly affected by pollutants emitted from factories.

The existence of dark matter has not yet been fully proven.

Antibiotics don't work for colds, so please don't take them unnecessarily.

It is said that antimatter has properties opposite to those of matter.

We exist as a part of the material world.

This food may contain carcinogens.

Neurotransmitters are responsible for transmitting information between nerve cells.

Chemotransmitters play an important role in the transmission of information between nerve cells.