The book of kells (fig. 15-1) was produced on an animal skin prepared for writing.

The book of Kells is gospel (religious book for Christianity)dated to 9th century was written vellum which is an animal skin with softer leather Answer Velum

Cell division is important to single celled organisms because it allows the cells to reproduce. through cell division, cells make exact copies of themselves. when single celled organisms go through cell division, they make exact copies of themselves which is how they reproduce.