In chemistry class, I learned about acid anhydride.

In chemistry class, I learned about acidic oxides.

Lower fatty acids play an important role in the human body.

Essential fatty acids are necessary to be taken from our diet because our body cannot produce them on its own.

Essential amino acids are vital nutrients for the human body.

This fossil is made of carbon.

Daisan Beer is my favorite beer.

The thirteenth day of the month is my birthday.

It's fun to ride a duck boat on the lake in the park.

I greeted the neighbor.