What are the simple meters?

This symbol is located on top of the first note or rest of every measure.

Is eighth note a quarter note with a beam?

We can Identify the meter of a song, if we count the beats of the notes and rest on every measure.

How is that possible that we can identify the meter of a song, if we just looked for its time signature? Explain your answer in 1 to 3 sentences.

Rhythmic comes from a greek word ________ which means to flow or to steam.