The steam organ played a lively tune at the carnival.

The steam organs were played at the carnival.

The hydraulic organs in the museum are beautifully preserved.

The hydraulic organ is a musical instrument that uses water to produce sound.

I heard the beautiful melodies of street organs while walking through the city.

The church organ played a beautiful melody during the wedding ceremony.

The church organs filled the cathedral with beautiful music.

The paratympanic organ is responsible for regulating pressure in the middle ear.

The study of proto-organisms is essential for understanding the origins of life.

Proto-organisms are the earliest forms of life on Earth.