Silk comes from the cocoons of silkworms. Silkworms are the larvae of silk moths. The silkworms produce silk to protect themselves while they transform into moths. Silk is a natural protein fiber that is prized for its strength, softness, and luster.To produce silk, silkworm eggs are hatched and the larvae are fed mulberry leaves. The silkworms grow rapidly and eat a lot of leaves. After about two weeks, the silkworms are ready to spin their cocoons. The silkworms spin cocoons by secreting a liquid protein called fibroin. The fibroin hardens when it comes into contact with the air, forming a strong and silky thread.

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