He is the main organizer of this event.

Oxygen, which is one of the chemical elements, is necessary for us to breathe.

My friend lives in Arkansas.

He has the spirit of mutual concession.

You can put out oversized garbage every first Saturday of the month.

I love histology classes.

This antitoxin is used to counteract that toxin.

Carbon monoxide is a colorless, odorless gas, and it is dangerous to inhale.

This candy contains sorbitol.

The nitrogen cycle is very important for maintaining ecosystems on Earth.