Final answer:
Catgut and silk sutures are two types of absorbable sutures made from nonsynthetic materials that are absorbed by the body over time.
Step-by-step explanation:
One type of absorbable suture made from nonsynthetic materials is catgut. Catgut is made from the submucosa of the intestines of sheep or goats.
Another type is silk sutures, which are made from the silk fibers produced by silkworms.
Both catgut and silk sutures are absorbed by the body over time, eliminating the need for suture removal.