What Am I? #2

I swirl and I swirl, never seeming to stop.
Loops and loops on top of each other.
I can be large, but I can also be small.
I can vary in a few different ways.
Sometimes my loops are broken and do not connect.
Every preschool student should know what I am.
What am I?

Highlight for the answer.
Answer: [ Number 8 ]

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