Which word could describe a discussion in which only one person talks and listens?

The original thirteen colonies decided to do this in the late 1700's when they became the United States of American.

What word describes an organism with only one cell?

This creature looks like a horned horse.

A clown often rides on this at the circus.

This word would best describe a one-way street.

This one-piece outfit is often worn by dancers.

A group often says the Pledge of Allegiance together or in _____.

Which word can be used to describe almost anything that is put together into a group?