Unraveled

The blanket's seam has unraveled.

A seam on the blanket has unraveled.

The stitches on the blanket have unraveled.

Why some cases are mild and others are severe has been something of a mystery that scientists in the U.S. and Nicaragua have now unraveled.

The cat unraveled the spool of thread.

She took the distaff and the wool she had just unraveled in order to begin spinning.